MAMMALIA— PHYSIOLOGY 48 1 



the intelligence. Small doses of tnorphine produce sleep in the goat, 

 horse and ass. Amygdalin does not affect dogs, but kills rabbits! 

 An especial degree of tolerance to atropine is found in the herbivora.* 

 Atropine effects pass off in rabbits' hearts sooner than in other 

 animals by the active decomposition of the alkaloid which occurs 

 in their plasma. Rabbits are not susceptible to belladonna. Rats' 

 hearts are much less susceptible than rabbits' to digitalis. Doses 

 of lead and nicotine sufficient to kill a man do not injure the goat. 



