458 PA THOGENIC BA CTERIA. 



death in the presence of oxygen. This is, however, un- 

 true, for the rapid development of a permanent form in 

 the resisting spores of the bacillus makes the pollution 

 of the soil exceedingly dangerous for cows who subse- 

 quently browse upon it. That the spores are of great 

 vitality is shown by the well-known laboratory method 

 of keeping them on hand for experimental purposes, dried 

 in the muscular tissue of a diseased animal. 



Every precaution should be exerted to have the affected 

 animals isolated, and their cadavers disinfected and de- 

 stroyed or buried in such a manner that subsequent 

 infection is impossible. 



Statistical results of Guillod and Simon, based upon 

 3500 protective inoculations, show a distinct reduction 

 of the death-rate from 5-20 per cent, in unprotected 

 animals to 0.5-2 per cent, in protected animals. 



