. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. [land at nst; in B, t be ordinary sd through its Is smaller. It Inogen. 9 protoplasmic, y, the nucleus ing a probable icesses. sen established ih, BO that we 1 facts. ctive and, from >rmer are con-. wLangley). Fignras partly dia- irgans. Proto- tain substance. DIGESTION OP FOOD. 821 which is an antecedent of the final pixiduct, which we term a ferment It is now customar
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. [land at nst; in B, t be ordinary sd through its Is smaller. It Inogen. 9 protoplasmic, y, the nucleus ing a probable icesses. sen established ih, BO that we 1 facts. ctive and, from >rmer are con-. wLangley). Fignras partly dia- irgans. Proto- tain substance. DIGESTION OP FOOD. 821 which is an antecedent of the final pixiduct, which we term a ferment It is now customary to speak of these changes as constructive (anabolic) and destructive (katabolic), though we have already pointed out (page 268) that this view is, at best, only one way of looking at the matter, and we doubt if it may not be cramping and misleading. We must also urge caution in regard to the conception to be associated with the use of the terms " resting " and " active staee It is not to be forgotten that strictly m livmg cells there'is no absolute rest^-such means death ; but, if these terms be understood as denoting but degrees of activity, they need not mislead. It is ahw more than probable that in certam of the glands, or in some animals, the processes go on simultane- ously: the protoplasm being renewed, the zymogen, or mother- fennent, being formed, and the latter converted into actual fer- ment, all at the same time. The nature of secretion is now tolerably clear as a whole; though it is to be remembered that this account is but general, and Suit there are many mi:ior differences Tor each gland and variations that can scarcely be denominated mmor for different animals. Evidently no theory of fUtration, no pro<»s8 depend- ing solely on blood-pressure, wUl apply here. And if m this, the best-studied case, mechanical theories of vital proojsses utterly fail, why attempt to fasten them upon other ghmds, as the kidneys and the lungs, or, indeed, apply
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