As the time for-the distribution draws near, once more I would like to remind your readers of our Christmas Gifts Fund. Will those who have not yet sent in their contributions please do so as soon as possible? It is my earnest hope that the response to my appeal may be a particularly generous one this year, as it would be such a real act of kindness if we were in a position to give £3 to each of our old people instead of the usual £2.
IN physiological experiments it is very frequently necessary or convenient to record phenomena at a distance from the place of their occurrence. Up to the present time the most useful and generally employed apparatus for this purpose has been the drum introduced by Buisson, but generally known as Marey's. The movements which it registers are transmitted from the place where they appear to the membrane of the drum by means of air. A properly constructed drum is, for many purposes, a very delicate form of registration apparatus. Numerous experiments have shewn that air is a very reliable medium of transmission, and, for complicated or rapidly recurring movements, is greatly superior to a liquid for this purpose. The weight and inertia of the mass of liquid together with the resistance to its passage through tubes of narrow calibre render a liquid connection very unsatisfactory for delicate experimentation.
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