112 POISONOUS PKOTEINS 



tone, egg white, etc. The explanation is fur- 

 ther confirmed by the demonstration that the 

 protein poison liberated by chemical agents in 

 vitro produces a like effect upon all cells. By 

 this simple procedure the sensitiveness of per- 

 sons to certain proteins may be demonstrated 

 and the degree roughly approximated. Pos- 

 sibly sensitiveness to horse serum might be 

 tested in this way preliminary to the adminis- 

 tration of diphtheria antitoxin, but I have not 

 known of its being tried. 



