: Rough Ways Made Smooth: A series of familiar essays on scientific subjects by Proctor Richard A Richard Anthony - Science

@FreeBooks

Posted in: #FreeBooks #FreeBooksIndia #FreeBooksApp #gg

Vote Up Vote Down   0 Reactions

Login to give Reaction!

l propulsion, which is that as little as possible--and therefore, if possible, none at all--of the energy employed to produce propulsion should be expended in injurious work. Even with the best carriages, he pointed out, there remain vibrations and shocks which must be attacked and destroyed to render the conditions of traction more perfect; they are veritable shocks, which use up part of the work of the horse in giving only hurtful effects, bruising the animal's breast, injuring his muscles, and, in spite of the padding of the collar, sometimes wounding him. Then he showed a simple experiment suggested by the able dynamician, Poncelet. To a weight of five kilos, a string is attached by which the weight can be lifted, but not much more. Then the experimenter tries to lift the weight rapidly with the string, which breaks without moving the weight, while the fingers are more or less hurt by the sudden shock. If now, a cord of equal strength, but slightly elastic, is substituted, the experiment ends differently. The sudden effort of elevation is transformed into a more prolonged action, and the weight is raised without bruising the fingers or breaking the cord. Yet a still more sudden movement would break the cord in this case, though a yet more extensible cord would resist even a yet more sudden jerk. According to the strength of the cord, its extensibility, and the weight to be lifted, must be the nature of the upward pull in order that the greatest possible velocity may be communicated without injury to the cord or to the lifter's hand. This simple series of experiments involves the essential principles of effective propulsion, where, at least, great velocity is among the results to be attained.

There is direct evidence from the results of many years of racing to show that this difference really exists, as might be expected, though the evidence may probably be questioned by those who maintain that there is but one good rowing style. It is well known that the style approved by 'Oarsmen' in the work above mentioned was first definitely inculcated by Cambridge oarsmen. There is internal evidence in the pamphlet itself to show that some, and, therefore, probably all, who took part in preparing the work were Cambridge men. Again, it is well known that certainly until 1868, and perhaps later, the University crew at Cambridge was 'coached' by an 'ancient mariner,' who, if not one of the 'Oarsmen' and, as was generally reported, the actual writer of the 'Principles of Rowing,' was unquestionably imbued with the old fashioned doctrines. Now, of the six races rowed on the Thames in the old fashioned racing boats, Cambridge won no less than five. The Oxford crews, who rowed in a style more nearly resembling that now rowed by the most successful crews , were not only beaten in every race save one, but in three cases were beaten out of all reason. Half a minute was the amount by which Cambridge won in 1845; but in 1836 they won by one minute, in 1841 by one minute and a quarter, and in 1839 by nearly two minutes. No wonder that when outrigged boats came in Cambridge oarsmen were loth to modify a style which had gained them so many and such striking successes. Nor did it greatly matter, when this happened in 1846, whether the style of rowing was modified or not. The first specimens of outrigged racing boats occupied a sort of half-way position between the old-fashioned inrigged craft and the exceedingly light, keelless boats now used. Thus, during the seven races rowed in the earlier form of outrigged boats, success was pretty equally divided between Oxford and Cambridge. In one race Oxford won on a foul; of the other six Cambridge won three, and Oxford also won three. But since the present form of racing boat was adopted Oxford has been almost as successful as Cambridge had been in the first nine or ten races. In 1857 Oxford won easily; in 1858 Cambridge won, but the stroke of the Oxford boat could use but half his strength, the forward or working thole of his rowlocks having been bent outwards by a wave which caught his oar before the race began. In 1859 Cambridge sank, and, though she was four lengths behind when this happened, there can be little doubt she would have won but for the original cause of the disaster--a wave which had half filled the Cambridge boat as she was turning to take her place at the starting-point. In 1860 Cambridge won by one length only. Then, as everyone remembers, there followed nine successive Oxford victories, some of which were of the most hollow kind. Cambridge then gave up the style to which she had so long been faithful. One of the ablest of the Oxford oarsmen, who was, however, connected in some degree with Cambridge, trained and coached the Cambridge crew of 1870, the stroke of which, it should be mentioned, was proficient in the correct style before he went to Cambridge. That year and for the four next years Cambridge won, though never in the hollow fashion in which Oxford had won the victories of 1861, 1862, 1863, 1864, and 1868. The lead of Oxford at the finish of these five races averaged over nine lengths, while the lead of Cambridge in the five races of 1870-74 averaged little over two lengths. In 1875 Oxford won by ten lengths, Cambridge in 1876 by five. In 1877 occurred the celebrated dead heat; but before bow's oar broke Oxford had won 'bar accidents.' In 1878 Oxford won, and again by ten lengths. Of the 25 races actually rowed to a finish since outriggers were introduced, Oxford has won 14, Cambridge 11; of the 19 so rowed out since the true modern racing boat was used, Oxford has won 11 and Cambridge 8. The difference is sufficient in either case to show that there is a true difference of style, the style of Oxford being the better. But when we consider how the victories have been won this comes out still more clearly. Making due estimate of the number of lengths corresponding to so many seconds of time difference , for which purpose it is sufficient to note that as many seconds as the race itself has occupied minutes are equivalent to about 6-1/2 lengths, we find for the 11 victories of Cambridge since 1846 about 30-1/4 lengths, and for the 14 rowed-out victories of Oxford about 106-1/2 lengths--the Cambridge average lead being thus found to be less than three lengths, while the Oxford average lead at the finish has been close on eight lengths.

The difference cannot reasonably be assigned to any cause which was in operation when Cambridge had the larger share of victories. Nearly every cause which has been commonly assigned, including the unquestionably inferior arrangements for college racing at Cambridge, falls into this category. There can be very little doubt that the true explanation, as well of Cambridge success before 1850 as of Oxford success since then, resides in the circumstance that the two Universities have in the main adopted throughout the whole series of contests two different styles--each style excellent in itself, but the Cambridge as unquestionably superior to the Oxford for the heavier kinds of river boats as the Oxford style is superior to the Cambridge for the boats now actually used in river races. What the difference in the two styles is I shall now briefly indicate.

Rather more than a quarter of a century ago two Americans visited London, who called themselves professors of Electro-Biology, and claimed the power of 'subjugating the most determined wills, paralysing the strongest muscles, preventing the evidence of the senses, destroying the memory of the most familiar events or of the most recent occurrences, inducing obedience to any command, and making an individual believe himself transformed into any one else.' All this and more was to be effected, they said, by the action of a small disc of zinc and copper held in the hand of the 'subject,' and steadily gazed at by him, 'so as to concentrate the electro-magnetic action.' The pretensions of these professors received before long a shock as decisive as that which overthrew the credit of the professors of animal magnetism when Haygarth and Falconer successfully substituted wooden tractors for the metallic tractors which had been supposed to convey the magnetic fluid. In 1851, Mr. Braid, a Scotch surgeon, who had witnessed some of the exhibitions of the electro-biologists, conceived the idea that the phenomena were not due to any special qualities possessed by the discs of zinc and copper, but simply to the fixed look of the 'subject' and the entire abstraction of his attention. The same explanation applied to the so-called 'magnetic passes' of the mesmerists. The monotonous manipulation of the operator produced the same effect as the fixed stare of the 'subject.' He showed by his experiments that no magnetiser, with his imaginary secret agents or fluids, is in the least wanted; but that the subjects can place themselves in the same condition as the supposed subjects of electro-biological influences by simply gazing fixedly at some object for a long time with fixed attention.

The condition thus superinduced is not hypnotism, or artificial somnambulism, properly so called. 'The electro-biological' condition may be regarded as simply a kind of reverie or abstraction artificially produced. But Braid discovered that a more perfect control might be obtained over 'subjects,' and a condition resembling that of the sleepwalker artificially induced, by modifying the method of fixing the attention. Instead of directing the subject's gaze upon a bright object placed at a considerable distance from the eyes, so that no effect was required to concentrate vision upon it, he placed a bright object somewhat above and in front of the eyes at so short a distance that the convergence of their axes upon it was accompanied with sufficient effect to produce even a slight amount of pain. The condition to which the 'subjects' of this new method were reduced was markedly different from the ordinary 'electro-biological' state. Thus on one occasion, in the presence of 800 persons, fourteen men were experimented upon. 'All began the experiment at the same time; the former with their eyes fixed upon a projecting cork, placed securely on their foreheads; the others at their own will gazed steadily at certain points in the direction of the audience. In the course of ten minutes the eyelids of these ten persons had involuntarily closed. With some, consciousness remained; others were in catalepsy, and entirely insensible to being stuck with needles; and others on awakening knew absolutely nothing of what had taken place during their sleep.' The other four simply passed into the ordinary condition of electro-biologised 'subjects,' retaining the recollection of all that happened to them while in the state of artificial abstraction or reverie.

We must note, however, in passing, that the condition of complete hypnotism had been obtained in several instances by some of the earlier experimenters in animal magnetism. One remarkable instance was communicated to the surgical section of the French Academy on April 16, 1829, by Jules Cloquet. Two meetings were entirely devoted to its investigation. The following account presents all the chief points of the case, surgical details being entirely omitted, however, as not necessary for our present purpose:--A lady, aged sixty-four, consulted M. Cloquet on April 8, 1829, on account of an ulcerated cancer of the right breast which had continued, gradually growing worse, during several years. M. Chapelain, the physician attending the lady, had 'magnetised' her for some months, producing no remedial effects, but only a very profound sleep or torpor, during which all sensibility seemed to be annihilated, while the ideas retained all their clearness. He proposed to M. Cloquet to operate upon her while she was in this state of torpor, and, the latter, considering the operation the only means of saving her life, consented. The two doctors do not appear to have been troubled by any scruples as to their right thus to conduct an operation to which, when in her normal condition, the patient strenuously objected. It sufficed for them that when they had put her to sleep artificially, she could be persuaded to submit to it. On the appointed day M. Cloquet found the patient ready 'dressed and seated in an elbow-chair, in the attitude of a person enjoying a quiet natural sleep.' In reality, however, she was in the somnambulistic state, and talked calmly of the operation. During the whole time that the operation lasted--from ten to twelve minutes--she continued to converse quietly with M. Cloquet, 'and did not exhibit the slightest sign of sensibility. There was no motion of the limbs or of the features, no change in the respiration nor in the voice; no motions even in the pulse. The patient continued in the same state of automatic indifference and impassibility in which she had been some minutes before the operation.' For forty-eight hours after this, the patient remained in the somnambulistic state, showing no sign of pain during the subsequent dressing of the wound. When awakened from this prolonged sleep she had no recollection of what had passed in the interval; 'but on being informed of the operation, and seeing her children around her, she experienced a very lively emotion which the "magnetiser" checked by immediately setting her asleep.' Certainly none of the hypnotised 'subjects' of Mr. Braid's experiments showed more complete abstraction from their normal condition than this lady; and other cases cited in Bertrand's work, 'Le Magnetisme Animal en France' , are almost equally remarkable. As it does not appear that in any of these cases Braid's method of producing hypnotism by causing the eyes, or rather their optical axes, to be converged upon a point, was adopted, we must conclude that this part of the method is not absolutely essential to success. Indeed, the circumstance that in some of Braid's public experiments numbers of the audience became hypnotised without his knowledge, shows that the more susceptible 'subjects' do not require to contemplate a point near and slightly above the eyes, but may be put into the true hypnotic state by methods which, with the less susceptible, produce only the electro-biological condition.

It will be well, however, to inquire somewhat carefully into this point. My present object, I would note, is not merely to indicate the remarkable nature of the phenomena of hypnotism, but to consider these phenomena with direct reference to their probable cause. It may not be possible to obtain a satisfactory explanation of them. But it is better to view them as phenomena to be accounted for than merely as surprising but utterly inexplicable circumstances.

Now we have fortunately the means of determining the effect of the physical relations involved in these experiments, apart from those which are chiefly due to imagination. For animals can be hypnotised, and the conditions necessary for this effect to be fully produced have been ascertained.

The most familiar experiment of this sort is sometimes known as Kircher's. Let the feet of a hen be tied together , and the hen placed on a level surface. Then if the body of the hen is gently pressed down, the head extended with the beak pointing downwards, touching the surface on which the hen stands, and a chalk mark is drawn slowly along the surface, from the tip of the beak in a line extending directly from the bird's eye, it is found that the hen will remain for a considerable time perfectly still, though left quite free to move. She is, in fact, hypnotised.

We have now to inquire what parts of the process just described are effective in producing the hypnotic condition, or whether all are essential to success in the experiment.

In the first place, the fastening of the feet may be dispensed with. But it has its influence, and makes the experiment easier. An explanation, or rather an illustration, of its effect is afforded by a singular and interesting experiment devised by Lewissohn of Berlin:--If a frog is placed on its back, it immediately, when the hand which had held it is removed, turns over and escapes. But if the two fore-legs are tied with a string, the frog, when placed on its back, breathes heavily but is otherwise quite motionless, and does not make the least attempt to escape, even when the experimenter tries to move it. 'It is as though,' say Czermak, describing the experiment as performed by himself, 'its small amount of reasoning power had been charmed away, or else that it slept with open eyes. Now I press upon the cutaneous nerves of the frog, while I loosen and remove the threads on the fore-legs. Still the animal remains motionless upon its back, in consequence of some remaining after-effect; at last, however, it returns to itself, turns over, and quickly escapes.'

Thus far the idea suggested is that the animal is so affected by the cutaneous pressure as to suppose itself tied and therefore unable to move. In other words, this experiment suggests that imagination acts on animals as on men, only in a different degree. I may cite here a curious case which I once noticed and have never been able to understand, though it seems to suggest the influence of imagination on an animal one would hardly suspect of being at all under the influence of any but purely physical influences. Hearing a noise as of a cat leaping down from a pantry window which looked out on an enclosed yard, I went directly into the yard, and there saw a strange cat running off with a fish she had stolen. She was at the moment leaping on to a bin, from the top of which, by another very easy leap, she could get on to the wall enclosing the yard, and so escape. With the idea rather of frightening her than of hurting her I threw at the thief a small piece of wood which I had in my hand at the moment. It struck the wall above her just as she was going to leap to the top of the wall, and it fell, without touching her, between her and the wall. To my surprise, she stood perfectly still, looking at the piece of wood; her mouth, from which the fish had fallen, remaining open, and her whole attitude expressing stupid wonder. I make no doubt I could have taken her prisoner, or struck her heavily, if I had wished, for she made no effort to escape, until, with a parlour broom which stood by, I pushed her along the top of the bin towards the wall, when she seemed suddenly to arouse herself, and leaping to the top of the wall she made off. My wife witnessed the last scene of this curious little comedy. In fact, it was chiefly, perhaps, because she pleaded for mercy on 'the poor thing' that the soft end of the broom alone came into operation; for, though not altogether agreeing with the Count of Rousillon that anything can be endured before a cat, I did not at the moment regard that particular cat with special favour.

Free books android app tbrJar TBR JAR Read Free books online gutenberg

(0)

Login to post a comment!