REPORT ON DISEASES OF DOMESTIC ANIMALS. 
225 
wherever it threatens to attain a dangerous prevalence. 
TUBERCULOSIS IN ANIMALS AND MAN. 
It is only since the inoculation experiments of Villemin that 
the dangers resulting from tuberculous animals have been at all 
appreciated. To-day after ten years of experimental observations 
by Villemin, Viscar, Klebs, Zurn, Bollinger, Leisering, Chauveau, 
Bagg, Seramer, Guenther, Harms, Biffi, Virgad, Gerlach, Buhl, 
Tilbury Fox, Burden Sanderson, and a host of others, it has been 
definitely established: 1st, that tuberculosis can be transmitted 
from animal to animal, from man to animals, and presumably 
from animals to man, by inoculation, or by the accidental contact 
of tuberculous matter with a raw or abraded surface; 2d, that 
raw, tuberculous matter taken from man and animals and eaten 
by other animals may determine tuberculosis in the latter; 3d, 
that even the flesh of tuberculous animals will sometimes pro¬ 
duce tuberculosis in animals that consume it, though with less 
certainty than if the tubercle itself were taken; 4th, that the 
milk of tuberculous animals will at times produce tuberculosis in 
susceptible subjects, and above all where the morbid deposit has 
taken place in the udder; 5th, that cooking of the tuberculous 
matter gives no guarantee of protection, as flesh is a poor con¬ 
ductor of heat, and tubercle that had been boiled from a quarter 
to half an hour has readily infected a number of animals that par¬ 
took of it; 6th, that tuberculous matter mixed with water and 
thrown into the air with an atomizer causes with great regularity 
the development of the tubercles in the lungs of animals respir¬ 
ing such air. The above conclusions will admit of some qualifi¬ 
cations. It may be admitted, for example, that the consumption 
of the flesh and milk of tuberculous animals is often followed by 
no perceptible injury. Phthisical cows are often eaten without 
causing obvious disease in the consumers. I have known large 
dairies of tuberculous cows, in the hands of vigorous and healthy- 
looking owners, who consumed the milk freely. I have kept two 
rabbits consuming all the milk of a tuberculous cow for months, 
and until the latter died without developing any signs of tuber¬ 
culosis in the rabbits. I have kept other rabbits for two months 
