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A SCOTTISH MARINE STATION.
The wonders discovered by the chief scientific cruises of recent years have greatly increased the interest of the public in the science of the sea, and this public interest has quite lately assumed a tangible form in the foundation of the Scottish Marine Station for Scientific Research at Granton, near Edinburgh. To understand the importance and value of this Station, one must know something of the difficulties presented to any one who wishes to solve some special problem connected with the life which swarms in the waters around our coasts. He must rely on the help of fishermen for collecting specimens; and if he cannot go to the expense of hiring a boat and crew, he requires to content himself with any selection of their 'rubbish' which they may be pleased to make. Should he wish to examine any locality minutely, he must purchase a dredge and tow-nets, leads and lines, and bottles and boxes to contain the specimens which may be obtained. The difficulty is only half overcome when the work of collecting is over. It is impossible to convey the creatures alive to any distance; and after a few attempts to do so, the naturalist either hires a room in the fishing-village for his work, or gives up the study of marine life altogether; unless he steer a middle course, and content himself with a bare enumeration of species and a description of the external appearance of his specimens.
The individual who is desirous of making chemical or physical observations on the wide sea is in a still more evil case. His apparatus is more costly and more complicated than that of the biologist; it is less easy to manage in a boat not specially adapted for the purpose; and the immediate vicinity of a laboratory is of the first importance. The obstacles, in fact, are so numerous, that observations of this nature have been almost entirely neglected in Great Britain. Now and then, it is true, the fire of scientific enthusiasm burns strong enough in a man to enable him to overcome all difficulties, and to carry on a brilliant research with complete success to a satisfactory conclusion. The work of such men is monumental; but they do not appear many times in a century. The name of one marine chemist is associated with Edinburgh; it is that of Dr John Murray, who in the year 1816 made a series of researches on sea-water collected at Trinity. His work settled a most important point of theoretical chemistry, and it is referred to as of value to this day.
The work which is being carried on at the Marine Station at present is divided between four workers. Mr J. T. Cunningham, the naturalist in charge, is making a research into the development of the Teleostian fishes, the great group to which most of our food-fishes, such as the cod, herring, and haddock, belong. Mr J. R. Henderson has commenced to form a collection of all the animal life of the Firth of Forth; while Mr John Rattray is proceeding with a similar collection of the algae or seaweeds, and is also making a detailed study of the diatoms of the district, a piece of work which has never previously been attempted. Mr Hugh Robert Mill has charge of the daily meteorological observations at the Station, and he is working at the chemical and physical study of estuary-water, examining the variations in saltness and in temperature which occur from the fresh water to the open sea, and comparing them at different seasons. The work at the Station is thus seen to be purely scientific; and the results which will ultimately be obtained must be of great practical importance. Any scientific man is welcomed to work at the Station on special problems, without charge, and several gentlemen have taken advantage of the privilege.
It may give a better idea of the working of the various departments if the actual methods employed be shortly described.
The chemical and physical work done at sea is chiefly the collection of samples of water and the observation of temperature. Water from any moderate depth is collected by lashing a bottle to the sounding-line and lowering it to the proper point; the stopper is then pulled out by a cord and the bottle allowed to fill. The water in the bottle is not changed in its ascent, as the mouth is narrow and it always hangs vertically. When the sea is rough or the depth is great, it is necessary to employ some other means. The 'slip-water-bottle' is convenient for most purposes. It consists of a brass disc covered with india-rubber, and supporting a central column to which the line is attached. This is lowered to the required depth, and then a hollow brass cylinder, open below, but closed above except for a hole that just allows the line to pass, is allowed to slip down the line. The base of the cylinder strikes on the rubber-covered disc, and securely incloses a sample of the water, which is run off by a stop-cock into a bottle after the whole has been hauled on board. The water must always be brought to the laboratory in stoppered bottles, which are entirely filled, and have had the stoppers tied down from the moment of collecting.
The third form of thermometer has been found the most convenient, and, with some modification, the best for the purposes of the Station. It is Negretti and Zambra's deep-sea thermometer, and its principle is that when the temperature of the water is attained by the thermometer the instrument is made to turn over; the mercury column always breaks at the same point, a contraction near the bulb; the part which had been beyond the bulb remaining in the inverted tube, which is graduated so as to show the temperature at the moment of inversion. Its great advantage is that no subsequent change of temperature affects the instrument until it is set again. Its great defect is that it is difficult to be sure when it has turned over. The simple and ingenious inverting mechanism of Magnaghi is hardly trustworthy; but an improvement has been effected, in consequence of the experience gained at the Scottish Station, which makes the turning of the thermometer, or of any number of thermometers on the same line, a matter of certainty.
The transparency of the water is measured roughly by noting the depth to which a large white disc continues visible when immersed. In the course of a trip from Grangemouth to the Isle of May, the colour of the water was observed to vary from dirty yellow to clear blue-green; and the disc, at first visible only three feet below the surface, was seen at a depth of six feet at Inchgarvie, at fifteen feet off Inchkeith, and at no less than sixty feet a little east of the May. Although the water of the upper reaches of the firth has been rendered muddy by the admixture of river-water, that at the May Island remains beautifully clear.
The routine-work of a biological and chemical laboratory is not of much interest to most people. For every day of collecting, with its fresh sea-air and new sea-sights, there must be several spent on the Ark in preserving the specimens, pressing plants, dissecting, mounting microscopic objects, observing densities, analysing water, calculating results, and such things; and all this work does not always tend to preserve an odourless atmosphere.
It is not intended that the Marine Station shall long continue of its present small dimensions. The experiment, so far as it has gone, has been so successful that it is now proposed to erect a large house on shore near the quarry, where there will be commodious laboratories, large aquaria, and rooms for the accommodation of the workers. In the meantime, Mr Irvine of Royston has generously given the use of an old manufactory which stands close to the sea beside the quarry. It was formerly used as a tannery, and so contains a number of large water-tight tanks built in the ground. There is a steam pumping-engine; and a very simple modification of the existing pipes will secure the supply of abundance of sea-water. The tanks will be used for experiments on fish-breeding; and the buildings in the works can be employed as laboratories without much alteration.
The Marine Station is intended to be a centre from which branches will extend to other parts of the country. It is in contemplation to erect a permanent marine observatory on the Clyde; and there will also be a portable station, probably a floating laboratory on the plan of the Ark, which can be taken to any part of the coast where it is desirable to make an extended series of observations.
The Granton Station is, with the exception of an annual grant of three hundred pounds from the Scottish Meteorological Society, entirely supported by voluntary subscription; and the heartiness with which the appeals to the public have been responded to by donations of money, apparatus, and material, shows how thoroughly the people of Scotland realise the importance of the work which is being done. The Government Grant Committee of the London Royal Society has made certain allowances to the members of the scientific staff for special researches; but this is not in any sense a government endowment of the Station, the Treasury having definitely refused to give any money for such a purpose. Although government support is an extremely desirable thing, the willing aid of an enlightened public is still better, and the Scottish Marine Station at Granton has this aid.
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