APPENDIX. 173 



puppy on rich. milk, and three hours after place it in a box or under a 

 bell-jar with a sponge soaked with ether or chloroform. When the 

 animal is completely insensible cut off its head, and then rapidly open 

 the abdomen and spread out the mesentery (the thin membrane which 

 slings the small intestine). In it will be seen a beautiful network of 

 lacteal vessels filled with milk-white liquid, some of which can be 

 collected if one of the lacteals be cut open. For comparison a kitten 

 or puppy may be used which has had no food for eight or ten hours. 

 The lacteals being then filled with clear, watery -looking lymph, will 

 be recognized with difficulty. 



