. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. Fia. 225.—^Alimentary canal of' embryo while the rudimentary mid-gut is still in con- tinuity with yelk-sac (KOUiker, after BischofE). A. View from before, a, pharyn- geal plates; b, pharynx: c, c, diverticula forming the lungs; d, stomach;./; diver- ticula of liver; g, membrane torn from yelk-sac; h, hind gut. B. Longitudinal section, a, diverticulum of a lung; &, stomach; c, liver; ce, yelk-sac. It is plain that if, in the digestive tract, foods are change
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. Fia. 225.—^Alimentary canal of' embryo while the rudimentary mid-gut is still in con- tinuity with yelk-sac (KOUiker, after BischofE). A. View from before, a, pharyn- geal plates; b, pharynx: c, c, diverticula forming the lungs; d, stomach;./; diver- ticula of liver; g, membrane torn from yelk-sac; h, hind gut. B. Longitudinal section, a, diverticulum of a lung; &, stomach; c, liver; ce, yelk-sac. It is plain that if, in the digestive tract, foods are changed in solubility and actual chemical constitution, this must have been brought about by chemical agencies. That food is broken up at the very commencement of the alimentary tract is a matter of common observation; and that there should be a gradual movement of the food from one part of the canal to another, where a different fluid is secreted, would be expected. As a matter of fact, mechanical and chemical forces play a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New York, Appleton
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