280 MICROBES, FERMENTS, AND MOULDS. 
In this case, it must be assumed that the bacilli and 
spores of anthrax had settled on Klein’s clothes, had 
spread to the table and floor of the second cabinet, 
and had passed thence on to the guinea-pig’s hair 
at the moment of the experiment. 
Another operator, who inoculated a guinea-pig 
with human tubercles, worked at the same table as 
that on which Klein performed his experiments on 
anthrax. Two of the guinea-pigs died with Bacillus 
anthracis in the blood. Yet the pipettes in use had 
always been repointed in the fire,-and all the other 
instruments had been thoroughly heated before the 
inoculation. 
In another case, on the contrary, a guinea-pig 
inoculated with an attenuated culture of Bacillus 
anthracis, of which the effect could not be fatal, was 
examined at the end of some weeks, and all its organs 
were found to be affected by the bacilli of tuberculosis. 
On consulting his notes, Klein found that on the same 
day he had performed experiments on tubercular 
matter in the same laboratory, but he had always 
been careful to use different instruments. The same 
phenomenon was produced in a rabbit which died, not 
of anthrax, with which he was supposed to have been 
inoculated, but of general tuberculosis. The inocu- 
lating liquid had clearly been impure. 
It is probable that Biichner’s experiments on the 
bacillus of meat were vitiated by a similar error. 
Biichner inoculated mice with this bacillus,and believed 
