490 



BACTERIOLOGY. 



ments the serum and culture were injected subcutane- 

 ously in rabbits at the same time, but in opposite sides 

 of the body : 



TABLE SHOWING STRENGTH OF AVERAGE GRADE OF ANTI- 



STREPTOCOCCIC SERUM GIVEN BY SELECTED HORSES AFTER 



SIX MONTHS OF INJECTION OF SUITABLE AMOUNTS OF 

 LIVING STREPTOCOCCI. 



The above results have been repeatedly obtained, and 

 are absolutely conclusive that, as Marmorek and others 

 have claimed, the serum of properly selected animals, 

 which have been repeatedly injected with living strep- 

 tococci in suitable doses, possesses bactericidal properties 

 upon the same streptococcus when it comes in contact 

 with it within the bodies of animals. 



Definite protection from the serum has been obtained 

 by many reliable observers since Marmorek' s first 

 reports. 



