92 PASTEUR AND AFTER PASTEUR 



disease could be induced in animals not only by 

 inoculation, but by mixing tuberculous matter with 

 their food. Cohnheim, in 1880, laid down the law 

 of all research into the nature of the disease : 



" Everything is tuberculous, that can produce 

 tuberculous disease by inoculation in animals which 

 are susceptible to that disease: and nothing, which 

 cannot do this, is tuberculous." 



In 1881, at the International Medical Congress 

 in London, Koch showed to some members of the 

 Congress the tubercle bacillus, the actual germs of 

 the disease. His first published account of this 

 great discovery is dated March 24, 1882. There 

 are two sentences in it which deserve the attention 

 of all men : 



" Henceforth, in our warfare against this fearful 

 scourge of our race, we have to reckon not with a 

 nameless something, but with a definite inmate of 

 the body ; its conditions of existence are for the 

 most part already known, and can be further 

 studied. . . . Before all things, we must shut off 

 the sources whence the infective material comes ; 

 so far as it lies in the power of man to do this." * 



tuberculosis, such as phthisis, caseous pneumonia, scrofula, 

 lupus, and joint disease, etc. ; and also the important fact that 

 ' grapes,"* a common disease of cattle, was due to the same 

 virus. 11 Evidence of Dr. C. J. Martin, Director of the Lister 

 Institute, before the Royal Commission on Vivisection, 

 July 10, 1907. 



* " In Zukunft wird man es im Kampf gegen diese 

 schreckliche Plage des Menschengeschlechter nicht mehr mit 



