140 IMMUNE SERA 



an antihaemolysin, but no antibody against haemor- 

 rhagin (of the rattlesnake). It is therefore without 

 effect on rattlesnake venom. Antivenin for the 

 latter may be prepared by immunizing goats with 

 corresponding venoms which have been attenuated 

 by weak acids. Such a serum, of course, possesses 

 no antineurotoxin and is therefore useless against 

 cobra and viper venoms. 



