1G8 
G. SEE. 
virus under the skin, in the serous membrane, in the an¬ 
terior chamber of the eye; 2d, through the artilicial and 
forced use of food coming from the tissues of the phthisical man 
or of tuberculous animals. Among these aliments, that which 
interests us most is the milk obtained from tuberculous cows, or 
from animals affected with tuberculous phthisis. 3d. The third 
mode of producing experimental absorption consists in breathing 
the contaminated air expired by sick beings, or, again, the air 
that has passed over tuberculous products, among which are dried 
and pulverized sputa. So far we have in view only the inoculated 
tuberculosis, which is yet, very fortunately, entirely experimental, 
the fact of the disease being contracted by inoculation not having 
been demonstrated in man. 
Tuberculosis was inoculated some twenty years ago by Vil- 
lemin ; it is to him that belongs, notwithstanding a few very 
imperfect anterior attempts, the honor of having produced, by 
inoculation, the disease in animals, and demonstrating in this way 
the morbid proofs, and proved its specificity and its viruleucy. 
Conditions of the Experimentation .—Several conditions are 
necessarily indispensable for the success of the operation, and it 
is because they have been overlooked or intentionally neglected 
that for so long a time numerous deceptions and unjust sus¬ 
picions were entertained. 1st. The substances for inoculation 
must be not only tuberculous, but baccilliferous, and free from 
any septic microphyte. 2d. The animal experimented upon must 
not be refractory to tuberculosis. 3d. The inoculation must be 
performed on organs or tissues which are not specially susceptible 
to excessive inflammatory action. 
I.—Bacilliferous Substances .—A point in discussion was, 
whether it was necessary to employ, preferably, miliary granula¬ 
tions, or the tubercle, or the caseous, or the so-called caseous 
pneumonia, which was first suspected of being inefficacious. 
Successes were obtained with all these diverse products, which are 
all phthisiogenous, because they contain the bacillus. Without 
this agent, which is the virulency itself, any attempt to inoculate 
would fail. It is for this reason that one may as well inject the 
so called scrofulous matter of bones, of glands, or the tubercle of 
