308 



COMPARATIVE PHYSIOLOGY. 



bringing the other to the exterior, as a fistulous opening, the 

 secretions could be collected, food introduced, etc. 



But it seems highly improbable that information approxi- 

 mately correct at best, and possibly highly misleading, could 





Fig. 251.— Intestinal tubules (follicles of Lieberkflhn) 1 x 100 (Sappey). 

 B, ox; C, sheep; D, pig; E, rabbit. 



A, from dog; 



be obtained in such manner. Moreover, the greatest diversity 

 of opinion prevails as to the facts themselves, so that it seems 

 scarcely worth while to state the contradictory conclusions ar- 

 rived at. 



It is, however, on the face of it, probable that the intestine — 

 even the large intestine — does secrete juices that in herbivora, 

 at all events, play no unimportant part in the digestion of their 



Fio. 252.— General view of horse's intestinea; animal is placed on its back, and intes- 

 tinal mass spread out (after Chanveau), A^ duodenum as it passes behind great 

 • mesenteric artery; B, free portion of small intestine; C, ileocsecal portion; D, 

 caecum; ^^ F, G^ loop formed by large colon; 6^, pelvic flexure; P^ F, point 

 where colic loop is doubled to constitute suprasternal and diaphragmatic flexures. 



