160 PHYSIOLOGY OF THE BACTERIA. 
bon) demonstrated thus that the disease was truly 
due to the solid particles; but he could not, as he 
did, affirm that the bacteria alone were endowed 
with virulent power, for he included at the same 
time all the other solid elements (fibrine, globules), 
and could not therefore eliminate the granulations 
of a virus other than the bacteria. Klebs does not 
believe that the bacteria cause death by asphyxia. 
This view is also sustained by Recklinghausen and 
Waldeyer, who believe that death results from 
embolism: according to Burdon-Sanderson, on the 
contrary, this is not the case. 
The observations and experiments up to this 
time demonstrated that the blood of charbon would 
transmit the disease. Davaine had said that the 
bacteria constituted the condition sine qua non of 
the development of these diseases, but he had 
against him the experiments of Leplat and Jail- 
lard. Besides, as he injected at the same time 
other corpuscles figurées, it was difficult to prove 
that they went for nothing in the production of 
charbon. Finally, this theory could not explain 
certain endemics (pastures in Auvergne). One 
could truly say, with Burden-Sanderson, that the 
virulent element can exist in two forms, — one 
fugitive (bacteria), one permanent, unknown. The 
point was to demonstrate it. This is what Koch 
has done. Having taken some bacteria, he culti- 
vated them in urine, or the aqueous humor of the 
eye of a horse, and remarked that they under- 
went a certain elongation, then presented brilliant 
points of condensation which became free; injected 
