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ANALYSIS OF THE SEXUAL IMPULSE.

Definition of Instinct--The Sexual Impulse a Factor of the Sexual Instinct--Theory of the Sexual Impulse as an Impulse of Evacuation--The Evidence in Support of this Theory Inadequate--The Sexual Impulse to Some Extent Independent of the Sexual Glands--The Sexual Impulse in Castrated Animals and Men--The Sexual Impulse in Castrated Women, After the Menopause, and in the Congenital Absence of the Sexual Glands--The Internal Secretions--Analogy between the Sexual Relationship and that of the Suckling Mother and her Child--The Theory of the Sexual Impulse as a Reproductive Impulse--This Theory Untenable--Moll's Definition--The Impulse of Detumescence--The Impulse of Contrectation--Modification of this Theory Proposed--Its Relation to Darwin's Sexual Selection--The Essential Element in Darwin's Conception--Summary of the History of the Doctrine of Sexual Selection. Its Psychological Aspect--Sexual Selection a Part of Natural Selection--The Fundamental Importance of Tumescence--Illustrated by the Phenomena of Courtship in Animals and in Man--The Object of Courtship is to Produce Sexual Tumescence--The Primitive Significance of Dancing in Animals and Man--Dancing is a Potent Agent for Producing Tumescence--The Element of Truth in the Comparison of the Sexual Impulse with an Evacuation, Especially of the Bladder--Both Essentially Involve Nervous Explosions--Their Intimate and Sometimes Vicarious Relationships--Analogy between Coitus and Epilepsy--Analogy of the Sexual Impulse to Hunger--Final Object of the Impulses of Tumescence and Detumescence.

LOVE AND PAIN.

The Chief Key to the Relationship between Love and Pain to be Found in Animal Courtship--Courtship a Source of Combativity and of Cruelty--Human Play in the Light of Animal Courtship--The Frequency of Crimes Against the Person in Adolescence--Marriage by Capture and its Psychological Basis--Man's Pleasure in Exerting Force and Woman's Pleasure in Experiencing it--Resemblance of Love to Pain even in Outward Expression--The Love-bite--In What Sense Pain May be Pleasurable--The Natural Contradiction in the Emotional Attitude of Women Toward Men--Relative Insensibility to Pain of the Organic Sexual Sphere in Women--The Significance of the Use of the Ampallang and Similar Appliances in Coitus--The Sexual Subjection of Women to Men in Part Explainable as the Necessary Condition for Sexual Pleasure.

The Definition of Sadism--De Sade--Masochism to some Extent Normal--Sacher-Masoch--No Real Line of Demarcation between Sadism and Masochism--Algolagnia Includes Both Groups of Manifestations--The Love-bite as a Bridge from Normal Phenomena to Algolagnia--The Fascination of Blood--The Most Extreme Perversions are Linked on to Normal Phenomena.

Flagellation as a Typical Illustration of Algolagnia--Causes of Connection between Sexual Emotion and Whipping--Physical Causes--Psychic Causes Probably More Important--The Varied Emotional Associations of Whipping--Its Wide Prevalence.

The Impulse to Strangle the Object of Sexual Desire--The Wish to be Strangled. Respiratory Disturbance the Essential Element in this Group of Phenomena--The Part Played by Respiratory Excitement in the Process of Courtship--Swinging and Suspension--The Attraction Exerted by the Idea of being Chained and Fettered.

Pain, and not Cruelty, the Essential Element in Sadism and Masochism--Pain Felt as Pleasure--Does the Sadist Identify Himself with the Feelings of his Victim?--The Sadist Often a Masochist in Disguise--The Spectacle of Pain or Struggle as a Sexual Stimulant.

Why is Pain a Sexual Stimulant?--It is the Most Effective Method of Arousing Emotion--Anger and Fear the Most Powerful Emotions--Their Biological Significance in Courtship--Their General and Special Effects in Stimulating the Organism--Grief as a Sexual Stimulant--The Physiological Mechanism of Fatigue Renders Pain Pleasurable.

Summary of Results Reached--The Joy of Emotional Expansion--The Satisfaction of the Craving for Power--The Influence of Neurasthenic and Neuropathic Conditions--The Problem of Pain in Love Largely Constitutes a Special Case of Erotic Symbolism.

THE SEXUAL IMPULSE IN WOMEN.

Introduction.

The Primitive View of Women--As a Supernatural Element in Life--As Peculiarly Embodying the Sexual Instinct--The Modern Tendency to Underestimate the Sexual Impulse in Women--This Tendency Confined to Recent Times--Sexual Anaesthesia--Its Prevalence--Difficulties in Investigating the Subject--Some Attempts to Investigate it--Sexual Anaesthesia Must be Regarded as Abnormal--The Tendency to Spontaneous Manifestations of the Sexual Impulse in Young Girls at Puberty.

Special Characters of the Sexual Impulse in Women--The More Passive Part Played by Women in Courtship--This Passivity Only Apparent--The Physical Mechanism of the Sexual Process in Women More Complex--The Slower Development of Orgasm in Women--The Sexual Impulse in Women More Frequently Needs to be Actively Aroused--The Climax of Sexual Energy Falls Later in Women's Lives than in Men's--Sexual Ardor in Women increased After the Establishment of Sexual Relationships--Women Bear Sexual Excesses Better than Men--The Sexual Sphere Larger and More Diffused in Women--The Sexual Impulse in Women Shows a Greater Tendency to Periodicity and a Wider Range of Variation.

Summary of Conclusions.

The Sexual Instinct in Savages.

The Development of the Sexual Instinct.

INDEX OF SUBJECTS.

ANALYSIS OF THE SEXUAL IMPULSE.

Definition of Instinct--The Sexual Impulse a Factor of the Sexual Instinct--Theory of the Sexual Impulse as an Impulse of Evacuation--The Evidence in Support of this Theory Inadequate--The Sexual Impulse to Some Extent Independent of the Sexual Glands--The Sexual Impulse in Castrated Animals and Men--The Sexual Impulse in Castrated Women, after the Menopause, and in the Congenital Absence of the Sexual Glands--The Internal Secretions--Analogy between the Sexual Relationship and that of the Suckling Mother and her Child--The Theory of the Sexual Impulse as a Reproductive Impulse--This Theory Untenable--Moll's Definition--The Impulse of Detumescence--The Impulse of Contrectation--Modification of this Theory Proposed--Its Relation to Darwin's Sexual Selection--The Essential Element in Darwin's Conception--Summary of the History of the Doctrine of Sexual Selection--Its Psychological Aspect--Sexual Selection a Part of Natural Selection--The Fundamental Importance of Tumescence--Illustrated by the Phenomena of Courtship in Animals and in Man--The Object of Courtship is to Produce Sexual Tumescence--The Primitive Significance of Dancing in Animals and Man--Dancing is a Potent Agent for Producing Tumescence--The Element of Truth in the Comparison of the Sexual Impulse with an Evacuation, Especially of the Bladder--Both Essentially Involve Nervous Explosions--Their Intimate and Sometimes Vicarious Relationships--Analogy between Coitus and Epilepsy--Analogy of the Sexual Impulse to Hunger--Final Object of the Impulses of Tumescence and Detumescence.

The term "sexual instinct" may be said to cover the whole of the neuropsychic phenomena of reproduction which man shares with the lower animals. It is true that much discussion has taken place concerning the proper use of the term "instinct," and some definitions of instinctive action would appear to exclude the essential mechanism of the process whereby sexual reproduction is assured. Such definitions scarcely seem legitimate, and are certainly unfortunate. Herbert Spencer's definition of instinct as "compound reflex action" is sufficiently clear and definite for ordinary use.

Of recent years there has been a tendency to avoid the use of the term "instinct," or, at all events, to refrain from attaching any serious scientific sense to it. Loeb's influence has especially given force to this tendency. Thus, while Pi?ron, in an interesting discussion of the question , thinks it would still be convenient to retain the term, giving it a philosophical meaning, Georges Bohn, who devotes a chapter to the notion of instinct , is strongly in favor of eliminating the word, as being merely a legacy of medieval theologians and metaphysicians, serving to conceal our ignorance or our lack of exact analysis.

Steinach found that, when sexually mature white rats were castrated, though at first they remained as potent as ever, their potency gradually declined; sexual excitement, however, and sexual inclination always persisted. He then proceeded to castrate rats before puberty and discovered the highly significant fact that in these also a quite considerable degree of sexual inclination appeared. They followed, sniffed, and licked the females like ordinary males; and that this was not a mere indication of curiosity was shown by the fact that they made attempts at coitus which only differed from those of normal males by the failure of erection and ejaculation, though, occasionally, there was imperfect erection. This lasted for a year, and then their sexual inclinations began to decline, and they showed signs of premature age. These manifestations of sexual sense Steinach compares to those noted in the human species during childhood.

The genesic tendencies are thus, to a certain degree, independent of the generative glands, although the development of these glands serves to increase the genesic ability and to furnish the impulsion necessary to assure procreation, as well as to insure the development of the secondary sexual characters, probably by the influence of secretions elaborated and thrown into the system from the primary sexual glands.

Halban argues that the primary sex glands do not necessarily produce the secondary sex characters, nor inhibit the development of those characteristic of the opposite sex. It is indeed the rule, but it is not the inevitable result. Sexual differences exist from the first. Nussbaum made experiments on frogs , which go through a yearly cycle of secondary sexual changes at the period of heat. These changes cease on castration, but, if the testes of other frogs are introduced beneath the skin of the castrated frogs, Nussbaum found that they acted as if the frog had not been castrated. It is the secretion of the testes which produces the secondary sexual changes. But Nussbaum found that the testicular secretion does not work if the nerves of the secondary sexual region are cut, and that the secretion has no direct action on the organism. Pfl?ger, discussing these experiments , disputes this conclusion, and argues that the secretion is not dependent on the action of the nervous system, and that therefore the secondary sexual characters are independent of the nervous system.

Speaking generally, Steinach considers that there is a process of "erotisation" of the nervous center under the influence of the internal testicular secretions, and that this persists even when the primary physical stimulus has been removed.

The experience of veterinary surgeons also shows that the sexual impulse tends to persist in animals after castration. Thus the ox and the gelding make frequent efforts to copulate with females in heat. In some cases, at all events in the case of the horse, castrated animals remain potent, and are even abnormally ardent, although impregnation cannot, of course, result.

The results obtained by scientific experiment and veterinary experience on the lower animals are confirmed by observation of various groups of phenomena in the human species. There can be no doubt that castrated men may still possess sexual impulses. This has been noted by observers in various countries in which eunuchs are made and employed.

In China, Matignon, formerly physician to the French legation in Pekin, tells us that eunuchs are by no means without sexual feeling, that they seek the company of women and, he believes, gratify their sexual desires by such methods as are left open to them, for the sexual organs are entirely removed. It would seem probable that, the earlier the age at which the operation is performed, the less marked are the sexual desires, for Matignon mentions that boys castrated before the age of 10 are regarded by the Chinese as peculiarly virginal and pure. At Constantinople, where the eunuchs are of negro race, castration is usually complete and performed before puberty, in order to abolish sexual potency and desire as far as possible. Even when castration is effected in infancy, sexual desire is not necessarily rendered impossible. Thus Marie has recorded the case of an insane Egyptian eunuch whose penis and scrotum were removed in infancy; yet, he had frequent and intense sexual desire with ejaculation of mucus and believed that an invisible princess touched him and aroused voluptuous sensations. Although the body had a feminine appearance, the prostate was normal and the vesiculae seminales not atrophied. It may be added that Lancaster quotes the following remark, made by a resident for many years in the land, concerning Nubian eunuchs: "As far as I can judge, sex feeling exists unmodified by absence of the sexual organs. The eunuch differs from the man not in the absence of sexual passion, but only in the fact that he cannot fully gratify it. As far as he can approach a gratification of it he does so." In this connection it may be noted that J?ger attributes the preference of some women--noted in ancient Rome and in the East--for castrated men as due not only to the freedom from risk of impregnation in such intercourse, but also to the longer duration of erection in the castrated.

In France Jayle found that, among 33 patients in whom ovariotomy had been performed, in 18 sexual desire remained the same, in 3 it was diminished, in 8 abolished, in 3 increased; while pleasure in coitus remained the same in 17, was diminished in 1, abolished in 4, and increased in 5, in 6 cases sexual intercourse was very painful. In two other groups of cases--one in which both ovaries and uterus were removed and another in which the uterus alone was removed--the results were not notably different.

In Germany Gl?veke found that desire remained in 6 cases, was diminished in 10, and disappeared in 11, while pleasure in intercourse remained in 8, was diminished in 10, and was lost in 8. Pfister, again , examined this point in 99 castrated women; he remarks that sexual desire and sexual pleasure in intercourse were usually associated, and found the former unchanged in 19 cases, decreased in 24, lost in 35, never present in 21, while the latter was unchanged in 18 cases and diminished or lost in 60. Keppler found that among 46 castrated women sexual feeling was in no case abolished. Adler also, who discusses this question , criticises Gl?veke's statements and concludes that there is no strict relation between the sexual organs and the sexual feelings. Kisch, who has known several cases in which the feelings remained the same as before the operation, brings together varying opinions of numerous authors regarding the effects of removal of the ovaries on the sexual appetite.

In America Bloom found that in none of the cases of women investigated, in which o?phorectomy had been performed before the age of 33, was the sexual appetite entirely lost; in most of them it had not materially diminished and in a few it was intensified. There was, however, a general consensus of opinion that the normal vaginal secretion during coitus was greatly lessened. In the cases of women over 33, including also hysterectomies, a gradual lessening of sexual feeling and desire was found to occur most generally. Dr. Isabel Davenport records 2 cases of women between 30 and 35 years of age whose erotic tendencies were extreme; the ovaries and tubes were removed, in one case for disease, in the other with a view of removing the sexual tendencies; in neither case was there any change. Lapthorn Smith has reported the case of an unmarried woman of 24 whose ovaries and tubes had been removed seven years previously for pain and enlargement, and the periods had disappeared for six years; she had had experience of sexual intercourse, and declared that she had never felt such extreme sexual excitement and pleasure as during coitus at the end of this time.

In England Lawson Tait and Bantock have noted that sexual passion seems sometimes to be increased even after the removal of ovaries, tubes, and uterus. Lawson Tait also stated that after systematic and extensive inquiry he had not found a single instance in which, provided that sexual appetite existed before the removal of the appendages, it was abolished by that operation. A Medical Inquiry Committee appointed by the Liverpool Medical Institute had previously reported that a considerable number of patients stated that they had suffered a distinct loss of sexual feeling. Lawson Tait, however, throws doubts on the reliability of the Committee's results, which were based on the statements of unintelligent hospital patients.

I may quote the following remarks from a communication sent to me by an experienced physician in Australia: "No rule can be laid down in cases in which both ovaries have been extirpated. Some women say that, though formerly passionate, they have since become quite indifferent, but I am of opinion that the majority of women who have had prior sexual experience retain desire and gratification in an equal degree to that they had before operation. I know one case in which a young girl hardly 19 years old, who had been accustomed to congress for some twelve months, had trouble which necessitated the removal of the ovaries and tubes on both sides. Far from losing all her desire or gratification, both were very materially increased in intensity. Menstruation has entirely ceased, without loss of femininity in either disposition or appearance. During intercourse, I am told, there is continuous spasmodic contraction of various parts of the vagina and vulva."

The independence of the sexual impulse from the distention of the sexual glands is further indicated by the great frequency with which sexual sensations, in a faint or even strong degree, are experienced in childhood and sometimes in infancy, and by the fact that they often persist in women long after the sexual glands have ceased their functions.

There appear to have been but few systematic observations on the persistence of the sexual impulse in women after the menopause. It is regarded as a fairly frequent phenomenon by Kisch, and also by L?wenfeld . In America, Bloom , from an investigation of four hundred cases, found that in some cases the sexual impulse persisted to a very advanced age, and mentions a case of a woman of 70, twenty years past the menopause, who had been long a widow, but had recently married, and who declared that both desire and gratification were as great, if not greater, than before the menopause.

Reference may finally be made to those cases in which the sexual impulse has developed notwithstanding the absence, verified or probable, of any sexual glands at all. In such cases sexual desire and sexual gratification are sometimes even stronger than normal. Colman has reported a case in which neither ovaries nor uterus could be detected, and the vagina was too small for coitus, but pleasurable intercourse took place by the rectum and sexual desire was at times so strong as to amount almost to nymphomania. Clara Barrus has reported the case of a woman in whom there was congenital absence of uterus and ovaries, as proved subsequently by autopsy, but the sexual impulse was very strong and she had had illicit intercourse with a lover. She suffered from recurrent mania, and then masturbated shamelessly; when sane she was attractively feminine. Macnaughton-Jones describes the case of a woman of 32 with normal sexual feelings and fully developed breasts, clitoris, and labia, but no vagina or internal genitalia could be detected even under the most thorough examination. In a case of Bridgman's, again, the womb and ovaries were absent, and the vagina small, but coitus was not painful, and the voluptuous sensations were complete and sexual passion was strong. In a case of Cotterill's, the ovaries and uterus were of minute size and functionless, and the vagina was absent, but the sexual feelings were normal, and the clitoris preserved its usual sensibility. Mund? had recorded two similar cases, of which he presents photographs. In all these cases not only was the sexual impulse present in full degree, but the subjects were feminine in disposition and of normal womanly conformation; in most cases the external sexual organs were properly developed.

It is proper to mention these ingenious arguments. They are, however, purely hypothetical, obviously invented to support a theory. It can scarcely be said that they carry conviction. We may rather agree with Guinard that so great is the importance of reproduction that nature has multiplied the means by which preparation is made for the conjunction of the sexes and the roads by which sexual excitation may arrive. As Hirschfeld puts it, in a discussion of this subject , "Nature has several irons in the fire."

It will be seen that the conclusions we have reached indirectly involve the assumption that the spinal nervous centers, through which the sexual mechanism operates, are not sufficient to account for the whole of the phenomena of the sexual impulse. The nervous circuit tends to involve a cerebral element, which may sometimes be of dominant importance. Various investigators, from the time of Gall onward, have attempted to localize the sexual instinct centrally. Such attempts, however, cannot be said to have succeeded, although they tend to show that there is a real connection between the brain and the generative organs. Thus Ceni, of Modena, by experiments on chickens, claims to have proved the influence of the cortical centers of procreation on the faculty of generation, for he found that lesions of the cortex led to sterility corresponding in degree to the lesion; but as these results followed even independently of any disturbance of the sexual instinct, their significance is not altogether clear . At present, as Obici and Marchesini have well remarked, all that we can do is to assume the existence of cerebral as well as spinal sexual centers; a cerebral sexual center, in the strictest sense, remains purely hypothetical.

Although Gall's attempt to locate the sexual instinct in the cerebellum--well supported as it was by observations--is no longer considered to be tenable, his discussion of the sexual instinct was of great value, far in advance of his time, and accompanied by a mass of facts gathered from many fields. He maintained that the sexual instinct is a function of the brain, not of the sexual organs. He combated the view ruling in his day that the seat of erotic mania must be sought in the sexual organs. He fully dealt with the development of the sexual instinct in many children before maturity of the sexual glands, the prolongation of the instinct into old age, its existence in the castrated and in the congenital absence of the sexual glands; he pointed out that even with an apparently sound and normal sexual apparatus all sorts of psychic pathological deviations may yet occur. In fact, all the lines of argument I have briefly indicated in the foregoing pages--although when they were first written this fact was unknown to me--had been fully discussed by this remarkable man nearly a century ago.

It will be seen that the question of the nature of the sexual impulse has been slowly transformed. It is no longer a question of the formation of semen in the male, of the function of menstruation in the female. It has become largely a question of physiological chemistry. The chief parts in the drama of sex, alike on its psychic as on its physical sides, are thus supposed to be played by two mysterious protagonists, the hormones, or internal secretions, of the testes and of the ovary. Even the part played by the brain is now often regarded as chemical, the brain being considered to be a great chemical laboratory. There is a tendency, moreover, to extend the sexual sphere so as to admit the influence of internal secretions from other glands. The thymus, the adrenals, the thyroid, the pituitary, even the kidneys: it is possible that internal secretions from all these glands may combine to fill in the complete picture of sexuality as we know it in men and women. The subject is, however, so complex and at present so little known that it would be hazardous, and for the present purpose it is needless, to attempt to set forth any conclusions.

Eduard von Hartmann long since remarked that the satisfaction of what we call the sexual instinct through an act carried out with a person of the opposite sex is a very wonderful phenomenon. It cannot be said, however, that the conception of the sexual act as a simple process of evacuation does anything to explain the wonder. We are, at most, in the same position as regards the stilling of normal sexual desire as we should be as regards the emptying of the bladder, supposing it were very difficult for either sex to effect this satisfactorily without the aid of a portion of the body of a person of the other sex acting as a catheter. In such a case our thoughts and ideals would center around persons of opposite sex, and we should court their attention and help precisely as we do now in the case of our sexual needs. Some such relationship does actually exist in the case of the suckling mother and her infant. The mother is indebted to the child for the pleasurable relief of her distended breasts; and, while in civilization more subtle pleasures and intelligent reflection render this massive physical satisfaction comparatively unessential to the act of suckling, in more primitive conditions and among animals the need of this pleasurable physical satisfaction is a real bond between the mother and her offspring. The analogy is indeed very close: the erectile nipple corresponds to the erectile penis, the eager watery mouth of the infant to the moist and throbbing vagina, the vitally albuminous milk to the vitally albuminous semen. The complete mutual satisfaction, physical and psychic, of mother and child, in the transfer from one to the other of a precious organized fluid, is the one true physiological analogy to the relationship of a man and a woman at the climax of the sexual act. Even this close analogy, however, fails to cover all the facts of the sexual life.

A very different view is presented to us in the definition of the sexual instinct as a reproductive impulse, a desire for offspring. Hegar, Eulenburg, N?cke, and L?wenfeld have accepted this as, at all events, a partial definition. No one, indeed, would argue that it is a complete definition, although a few writers appear to have asserted that it is so sometimes as regards the sexual impulse in women. There is, however, considerable mental confusion in the attempt to set up such a definition. If we define an instinct as an action adapted to an end which is not present to consciousness, then it is quite true that the sexual instinct is an instinct of reproduction. But we do not adequately define the sexual instinct by merely stating its ultimate object. We might as well say that the impulse by which young animals seize food is "an instinct of nutrition." The object of reproduction certainly constitutes no part of the sexual impulse whatever in any animal apart from man, and it reveals a lack of the most elementary sense of biological continuity to assert that in man so fundamental and involuntary a process can suddenly be revolutionized. That the sexual impulse is very often associated with a strong desire for offspring there can be no doubt, and in women the longing for a child--that is to say, the longing to fulfill those functions for which their bodies are constituted--may become so urgent and imperative that we may regard it as scarcely less imperative than the sexual impulse. But it is not the sexual impulse, though intimately associated with it, and though it explains it. A reproductive instinct might be found in parthenogenetic animals, but would be meaningless, because useless, in organisms propagating by sexual union. A woman may not want a lover, but may yet want a child. This merely means that her maternal instincts have been aroused, while her sexual instincts are still latent. A desire for reproduction, as soon as that desire becomes instinctive, necessarily takes on the form of the sexual impulse, for there is no other instinctive mechanism by which it can possibly express itself. A "reproductive instinct," apart from the sexual instinct and apart from the maternal instinct, cannot be admitted; it would be an absurdity. Even in women in whom the maternal instincts are strong, it may generally be observed that, although before a woman is in love, and also during the later stages of her love, the conscious desire for a child may be strong, during the time when sexual passion is at its highest the thought of offspring, under normally happy conditions, tends to recede into the background. Reproduction is the natural end and object of the sexual instinct, but the statement that it is part of the contents of the sexual impulse, or can in any way be used to define that impulse, must be dismissed as altogether inacceptable. Indeed, although the term "reproductive instinct" is frequently used, it is seldom used in a sense that we need take seriously; it is vaguely employed as a euphemism by those who wish to veil the facts of the sexual life; it is more precisely employed mainly by those who are unconsciously dominated by a superstitious repugnance to sex.

While, therefore, this analysis seems to include all the phenomena and to be worthy of very careful study as a serious and elaborate attempt to present an adequate psychological definition of the sexual impulse, it scarcely seems to me that we can accept it in precisely the form in which Moll presents it. I believe, however, that by analyzing the process a little more minutely we shall find that these two constituents of the sexual impulse are really much more intimately associated than at the first glance appears, and that we need by no means go back to the time when the sexual method of reproduction arose to explain the significance of the phenomena which Moll includes under the term contrectation.

While I regard Moll's analysis as a valuable contribution to the elucidation of the sexual impulse, I must repeat that I cannot regard it as final or completely adequate. As I understand the process, contrectation is an incident in the development of tumescence, an extremely important incident indeed, but not an absolutely fundamental and primitive part of it. It is equally an incident, highly important though not primitive and fundamental, of detumescence. Contrectation, from first to last; furnishes the best conditions for the exercise of the sexual process, but it is not an absolutely essential part of the process and in the early stages of zo?logical development it had no existence at all. Tumescence and detumescence are alike fundamental, primitive, and essential; in resting the sexual impulse on these necessarily connected processes we are basing ourselves on the solid bedrock of nature.

Moreover, of the two processes, tumescence, which in time comes first, is by far the most important, and nearly the whole of sexual psychology is rooted in it. To assert, with Moll, that the sexual process may be analyzed into contrectation and detumescence alone is to omit the most essential part of the process. It is much the same as to analyze the mechanism of a gun into probable contact with the hand, and a more or less independent discharge, omitting all reference to the loading of the gun. The essential elements are the loading and the discharging. Contrectation is a part of loading, though not a necessary part, since the loading may be effected mechanically. But to understand the process of firing a gun and to comprehend the mechanism of the discharge, we must insist on the act of loading and not merely on the contact of the hand. So it is in analyzing the sexual impulse. Contrectation is indeed highly important, but it is important only in so far as it aids tumescence, and so may be subordinated to tumescence, exactly as it may also be subordinated to detumescence. It is tumescence which is the really essential part of the process, and we cannot afford, with Moll, to ignore it altogether.

A better and more comprehensive statement was reached by Tillier, who, to some extent, may be said to have anticipated Groos. Darwin, Tillier pointed out, had not sufficiently taken into account the coexistence of combat and courtship, nor the order of the phenomena. Courtship without combat, Tillier argued, is rare; "there is a normal coexistence of combat and courtship." Moreover, he proceeded, force is the chief factor in determining the possession of the female by the male, who in some species is even prepared to exert force on her; so that the female has little opportunity of sexual selection, though she is always present at these combats. He then emphasized the significant fact that courtship takes place long after pairing has ceased, and the question of selection thus been eliminated. The object of courtship, he concluded, is not sexual selection by the female, but the sexual excitement of both male and female, such excitement, he asserted, not only rendering coupling easier, but favoring fecundation. Modesty, also, Tillier further argued, again anticipating Groos, works toward the same end; it renders the male more ardent, and by retarding coupling may also increase the secretions of the sexual glands and favor the chances of reproduction.

Another observer of birds, Mr. E. Selous, has made observations which are of interest in this connection. He finds that all bird-dances are not nuptial, but that some birds--the stone-curlew , for example--have different kinds of dances. Among these birds he has made the observation, very significant from our present point of view, that the nuptial dances, taken part in by both of the pair, are immediately followed by intercourse. In spring "all such runnings and chasings are, at this time, but a part of the business of pairing, and one divines at once that such attitudes are of a sexual character.... Here we have a bird with distinct nuptial and social forms of display or antics, and the former as well as the latter are equally indulged in by both sexes."

The same author argues that in the fights of two males for one female--with violent emotion on one side and interested curiosity on the other--the attitude of the former "might gradually come to be a display made entirely for the female, and of the latter a greater or less degree of pleasurable excitement raised by it, with a choice in accordance." On this view the interest of the female would first have been directed, not to the plumage, but to the frenzied actions and antics of the male. From these antics in undecorated birds would gradually develop the interest in waving plumes and fluttering wings. Such a dance might come to be of a quite formal and non-courting nature.

Such a theory as this fairly coincides with the views brought forward in the preceding pages,--views which are believed to be in harmony with the general trend of thought today,--since it emphasizes the importance of tumescence and all that favors tumescence in the sexual process. The so-called esthetic element in sexual selection is only indirectly of importance. The male's beauty is really a symbol of his force.

The debate which has for so many years been proceeding concerning the validity of the theory of sexual selection may now be said to be brought to an end. Those who supported Darwin and those who opposed him were, both alike, in part right and in part wrong, and it is now possible to combine the elements of truth on either side into a coherent whole. This is now beginning to be widely recognized; Lloyd Morgan, for instance, has readjusted his position as regards the "pairing instinct" in the light of Groos's contribution to the subject. "The hypothesis of sexual selection," he concludes, "suggests that the accepted male is the one which adequately evokes the pairing impulse.... Courtship may thus be regarded from the physiological point of view as a means of producing the requisite amount of pairing hunger; of stimulating the whole system and facilitating general and special vascular changes; of creating that state of profound and explosive irritability which has for its psychological concomitant or antecedent an imperious and irresistible craving.... Courtship is thus the strong and steady bending of the bow that the arrow may find its mark in a biological end of the highest importance in the survival of a healthy and vigorous race."

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