Elements of animal physiology, chiefly human . nates and phosphates. After much mental exertion or nervous exhaustion, thequantity of the phosphates excreted in the urine as acidphosphates, increases very greatly as the result of nervoustissue waste. lb may be as well to state, for the benefit of the non-chemicalreader, that the salts here mentioned are simply compounds ofsodium, lime, magnesia, &c., with chlorine, sulphuric, phosphoricjcarbonic, or other acids. 54 ANIMAL PHYSIOLOGY. 103. Endosmosis, Exosmosis, Osmosis (from Gr. osmos,impulse) is a species of physico-chemical action wliicli pr
Elements of animal physiology, chiefly human . nates and phosphates. After much mental exertion or nervous exhaustion, thequantity of the phosphates excreted in the urine as acidphosphates, increases very greatly as the result of nervoustissue waste. lb may be as well to state, for the benefit of the non-chemicalreader, that the salts here mentioned are simply compounds ofsodium, lime, magnesia, &c., with chlorine, sulphuric, phosphoricjcarbonic, or other acids. 54 ANIMAL PHYSIOLOGY. 103. Endosmosis, Exosmosis, Osmosis (from Gr. osmos,impulse) is a species of physico-chemical action wliicli prevails largely inliving bodies, moreespecially in thevarious processes ofnutrition, secretioiiyand respiration. Osmosis is theaction or processby which twodifferent liquidsseparated fromeach other by aporous solid, oran interveningmembrane will passthrough its sub-stance and 7)iixtogether on eitherside of it. Usuallya very much largerproportion of theone fluid than ofFig. 21. Illustration of Osmosis. the other ^M55es through the Experiment.—Procure a glass vessel, a glass tube with a smallbore and a curved end, a sinall bladder, some water, and somealcohol (spirits of wine). Fill tlie vessel two-thirds full of water,tie the bladder to the lower end of the tube, fill it with alcohol,and immerse it in the water. (See fig. 21.) The water will passin through the walls of the bladder by endosmosis until the tubenot only becomes full but overflows in drops, which may be col-lected and measured, in which case the instrument becomes anendosmeter. A very small quantity of the alcohol passes out of thebladder by exosmosis. If a thin collodion bag were substituted for the bladder, theprocess would be reversed, and much more alcohol Avould pass outof the collodion bag than water would pass in. FIBRIN. 55 Tlie two Greek prefixes endo, in, and exo, out, showthe direction in which the liquid passes. Mixed solutions may be analyzed on this 2>^^^nciplG;the process is then termed
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