I.] DISSKCTION OF A RABBIT AND OF A DOG. 9 



length of the intestine, the small cjedum, and 

 the less difference between the large and small 

 intestines. 

 The small intestine may be washed out by tying a 

 funnel into the duodenum, and letting water 

 from a tap stream down the funnel. The large 

 intestine may be similarly treated, 



20. Cut through the stomach along the lesser curva- 

 ture, throw away its contents and wash the 

 mucous membrane. Note that the mucous 

 membrane of the greater curvature is pale red, 

 that of the pylorus is greyish-white and semi- 

 transparent. The contrast is more marked 

 when the whitish superficial layer of mucous 

 cells is removed. 



The mucous membrane may be used to prepare a 

 glycerine extract of pepsin (cp. Lesson xvi.). 



21. Wash out the duodenum, its inner surface has 

 a velvety look which is characteristic of the 

 mucous membrane of the small intestine; it is 

 caused by the villi, examine these with a lens. 

 Observe the openings of the biliary and pancrea- 

 tic ducts, and carefully pass bristles through 

 them into the ducts. 



22. Cut open a piece of the large intestine, wash it, 

 and with a lens examine its inner surface ; it has 

 no villi. 



. 23.- Note again the position of the suprarenal bodies. 



24. Note the position of the kidneys, the left being 

 much nearer the pelvis than the right ; observe 

 on either side the ureter, a pale semi-transparent 



