. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 848 COMPARATIVE PHYSIOLOttY. There are two points that are very far from being deter^ mined: the one the fate of the products of digestion; the other the exact limit to which digestion is carried. How much—e. g., of proteid matter—does actually undergo conversion into peptone; how much is converted into leucin and tyrosin; or, again, what proportion of the albuminous matters are
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 848 COMPARATIVE PHYSIOLOttY. There are two points that are very far from being deter^ mined: the one the fate of the products of digestion; the other the exact limit to which digestion is carried. How much—e. g., of proteid matter—does actually undergo conversion into peptone; how much is converted into leucin and tyrosin; or, again, what proportion of the albuminous matters are dealt with as such by the in- testine without conversion into peptone at all, eithtr as soluble proteid or in the form of solid particles ? 1. It is generally believed that solu- ble sugars are absorbed, usually after conversion into maltose or glucose, by the capillaries of the stomach and intes- tine. 2. There is some positive evidence of the presence of fats, soaps, and sugars in unusual amount after a meal in the por- tal vein, which implies removal from the intestinal contents by the capillaries, though, so far as experiment goes, the fat is chiefly in the form of soaps, Certain experiments have been made. Fiu, 88B.—Intettiual vUlu (after Lcydig). a, a, a Hpitiwiiaicoveriiw; b,b, jongitodinai rauMuW Uv litrating the pyloric end of the stom- flben; d, lacteal. •'. ? T^. , . i_ :_i„ ?!... taplllarr networl ongitodlnal ma _ ^ ach, by introducing a cannula into the thoracic duct, so as to continually remove its contents, etc. But we are surprised that serious conclusions should have been drawn under such circumstances, seeing that the natural condi- tions are so altered. What we wish to get at in physiology is the normal function of parts, and not the possible results after our interference. Under such circumstances the phenomena may have a suggestive but certainly can not have a conclusive value. ,. It is a very striking fact that little peptone (none, according
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