Chap. 1 8.] Inteftlws of Brutes. 213 



num is more lax, and of larger diameter than the other 

 fmall inteftines, and by i:s various rifmgs and fallings 

 is calculated to retain the food for fome time before it 

 pafles into the jejunum. About fix inches from the 

 pylorus, the common bile duct and the duel: from the 

 pancreas pour their contents together into the duode- 

 num. 



Of the remaining part of the fmall inteftines, two 

 fifths are called the jejunum, and the remaining three 

 fifths the ileum, as no other characteriftic mark of dif- 

 tindlion can be pointed out. The upper part of the 

 fmall inteftines is indeed uniformly more red, rather 

 wider, and its ftructure more robuft than the lower 

 part, but the gradation is regular. Nothing particular 

 is to be obferved at any part, which can furnifti a juft 

 foundation for a change of name, and Haller accord- 

 ingly comprehended the jejunum and ileum under the 

 term of inteftinum tenue, or fmall interline. The je- 

 junum is placed more about the umbilical region, the 

 ileum more in the hypogaftric. The fmall inteftines 

 at length terminate in the large, in the hollow of the 

 right iliac bone, below the kidney. At this place 

 there is a valve, which exhibits the appearance of a flit 

 or chink. This valve permits a free paflfage from the 

 fmall inteftines to the large, but prevents any thing 

 from paffing readily from the large to the fmall. 



The caecum, which forms the beginning of the great 

 inteftines, may be confidered as a production of the 

 colon expanded into a bag. It is about four fingers 

 in length and as many in breadth. It is fituated in the 

 right iliac region, and refts on the broad part of the 

 os ileum. At its lower part it has a long fmall procefs, 

 called the vermiform, from its refemblance to an earth 

 worm. This procefs is plentifully furnifhed with 

 mucus, which it pours into the ceecum. In apes this 

 P 3 procefs 



