. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. PHYSICAL PROCESSES IN CELLS. ho Thus, dry will show a higher osmotic equivalent than fresh membranes or dried membranes moistened, from the fact that the membrane retains more water by imbibition, while the passage of the salt is facilitated. If an animal membrane separates water and alcohol, the water will pass in much greater amount, for membrane absorbs water much more readily than alcohol or a mixture of water and alcohol. Rubber or collodium membranes, on the other hand, allow alcohol to pa
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. PHYSICAL PROCESSES IN CELLS. ho Thus, dry will show a higher osmotic equivalent than fresh membranes or dried membranes moistened, from the fact that the membrane retains more water by imbibition, while the passage of the salt is facilitated. If an animal membrane separates water and alcohol, the water will pass in much greater amount, for membrane absorbs water much more readily than alcohol or a mixture of water and alcohol. Rubber or collodium membranes, on the other hand, allow alcohol to pass with greatest readiness, as such membranes absorb alcohol more readily than water. The general phenomena of osmosis may be well illus- trated by the egg-osmometer (Fig. 40). This is prepared by picking off a little of the shell from one end of an egg, taking care to leave the shell-membrane intact, while a glass tube is cemented around a small hole pierced through both shell and shell-membrane at the opposite end. The end at which the shell has been removed and the membrane left undisturbed is then immersed in distilled water. After a time it will be found that water has passed from the out- side to the interior of the egg, as shown by the increased volume, the white of the egg being forced up into the tube cemented on the open end of the egg. At the same time the addition of nitrate of silver to the water in which the egg was immersed will show, by the white precipitate formed, that the chlorides have passed from the inside to the outside of the egg. No trace of albumen, however, is to be seen in the distilled water. The salts of the egg, or its crystalloids, have' thus passed by osmosis through the egg-membrane, water has also passed, while the egg-albu- men, a colloid, has been retained. These facts, already alluded to, that crystalloids in solu- tion will pass through an animal membrane, while colloids will not, has been made use of in a process which is fre- quently emp
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