50 



Dr. R T. Hewlett. 



[Mar. 28, 



Of Series IV, none died, leaving 16 animals for experiment. 



All the surviving animals were subsequently inoculated with living 

 typhoid culture intra-peritoneally at varying dates, control animals being 

 similarly inoculated at the same time to test the virulence of the culture. 

 The controls weighed 300 to 360 grm. The results obtained are given in the 

 following tables : — 



Series I. — Inocidated with TO mgrm. of typhoid endotoxin on May 14, 

 1909. 



Table I. — Inoculated with Living Culture on June 18, July 17, and 

 July 21, 1209. 



4- Dead, June 19. 



Lived. 

 + Dead, June 19. 



M.L.D. = minimum lethal dose. 



