282 



COMPARATIVE PHYSIOLOGY. 



to the simple stomach of the Carnivora or of man ; and, before 

 the food reaches this region, it has been thoroughly masticated 

 and mixed with saliva. 



The stomach of the horse is small, though the intestine, 



Pio. 329.— The viscera of a rabbit as seen upon simply opening the cavities of the 

 thorax and abdomen without any further dissection. A, cavity of the thorax, 

 pleural cavity on either side; £, diaphragm; C, ventricles of the heart; D, auri- 

 cles; S, pulmonary artery; F, aorta; ff, lungs collapsed, and occupying only back 

 part of chest; ff, lateral portions of pleural membranes; /, cartilage at the end 

 of sternum (ensiform cartilage); JC, portion of the wall of body left between thorax 

 and abdomen; a, cut ends of the ribs; L, the liver, in this case lying more to the 

 left than to the right of the body; M, the stomnch, a large part of the greater 

 curvature being shown; JV, duodenum; 0. small intestine; P, the csecum, so 

 largely developed in this and other herbivorous animals; Q, the large intestine. 

 (Huxley.) 



