6 Bulletin 150. 



bouillon, and inoculated successfully upon a large number of 

 animals. 



Since that time (1882) his position has been corroborated by 

 all competent observers, and there is no truth in medicine more 

 thoroughly established to-day than the essential connection be- 



F,^i. 



'C> 



N 

 N 



>y ^ 



V 



n^ 



J 



( 



I. — A drawing from a preparation of tubercle bacilli tnag- 

 nified about 1000 diameters. 



tween tuberculosis and the tubercle bacillus. This bacillus has 

 been so often conveyed with destructive effect from man to the 

 smaller mammals, and even to cattle, that the essential identity 

 of human and bovine tuberculosis must be accepted. This state- 

 ment requires the qualification that the bacillus, like other patho- 

 genic germs, adapts itself to the conditions of the medium on 

 which it grows, and therefore, in the first place to the particular 

 genus of animals in which it has been living for some time, and 

 is therefore often less read}^ to grow in one of another kind 



