APPENDIX. 637 



continually wearing down, and renewing in the 

 same proportion, except that when the animal is 

 growing it is renewed faster, and in proportion to 

 its growth. The use of the whalebone, I should 

 believe, is principally for the retention of the food 

 till swallowed, and do suppose that the fish they 

 catch are small when compared with the size of 

 the mouth. 



The oesophagus is larger in proportion to the bulk 

 of the animal than in the quadruped, although not 

 so much so as it usually is in fish, which we may 

 suppose swallow their food much in the same way. 

 In the Piked Whale it was three inches and a half 

 wide. The stomach, as in other animals, lies on 

 the left side of the body, and terminates in the 

 pylorus towards the right. 



The Duodenum passes down on the right side, 

 very much as in the human subject, excepting 

 that it is more exposed, from the colon not cross- 

 ing it : it lies on the right kidney, and then passes 

 to the left side behind the ascending part of the 

 colon and root of the mesentery, comes out on the 

 left side, and getting on the edge of the mesentery 

 becomes a loose intestine, forming the jejunum. 

 In this course, behind the mesentery it is exposed, 

 as in most quadrupeds, not being covered by it 

 as in the human. The jejunum and ilium pass 

 along the edge of the mesentery downwards to 

 the lower part of the abdomen. The ilium near 

 the lower end makes a turn towards the right side, 

 and then mounting upwards, round the edge of 

 the mesentery, passes a little way on the right, as 



