272 BACTERIA. 



some time, furnished most rigorous proof of Davaine's hypo- 

 thesis. At the same time he was able to give much additional 

 information as to the development, mode of production, and 

 general life-history of the organism — information that could 

 only have been obtained by a long continued and careful 

 study of the organism outside the body. 

 The following year Pasteur also succeeded in cultivating 



Fhoto-micrograph of Anthrax bacilli in a preparation of the fresh spleen pulp of a 

 cow that had died from splenic fever, x looo. 



this organism as a saprophyte and from that time up to the 

 present new facts have constantly been garnered, and our 

 knowledge of the biological history of this organism has 

 been greatly extended. 



To observe the organism, a drop of blood is taken from 

 the spleen of a cow (or of any other animal that has died of 

 anthrax), and spread out between two cover glasses ; these are 



