50 
Table No. 43. — Comparative toxicity of French and other serums — Continued. 
G. P. 
No. 
First injection. 
Inter- 
val in 
days. 
Second injection. j 
Result. 
9552 
0.23 c. c. toxine No. 7+1/500 c.c. 
antitoxic horse serum (Ldrl. 
58A). 
G5 
0.2 c. c. antitoxic horse serum 
(Lyons) into brain. 
Dead in 3 minutes. 
9590 
0.23 c. c. toxine No. 7+1/320 c.c. 
antitoxic horse serum (Alex. 
A245) . 
65 
do 
Dead in 4 minutes. 
It therefore seems plain that the serums which do not produce 
untoward symptoms when injected into man, are quite as toxic upon 
sensitized guinea pigs, as the serums which have been followed by 
serious symptoms when injected into man. We believe the difference 
lies in the susceptibility of the individual and not in the toxicity of 
the serum. 
