.T. M’FADYEAN. ' 
Finally, it may be objected that any experiments of this 
nature, whether with blood, meat juice, or other materials 
taken from tuberculous carcases, are almost valueless unless 
the most scrupulous care has been taken to prevent accidental 
error. We know that the neglect of such precautions at one 
time led otherwise careful experimenters to conclude that 
various non-tuberculous products were capable of setting up 
a true tuberculosis. 
When the before-cited experiments with blood are criti¬ 
cised in the light of these objections, it is found that the 
majority of them fall to the ground. Thus Jeannel’s entire 
series of 24 were made with the blood of rabbits and guinea- 
pigs. At least 1 of Toussaint’s experiments was made with 
blood from a pig that was the subject of generalized tuber¬ 
culosis. Again, 2 of Gnltier’s experiments were made with 
the blood of tuberculous rabbits, and the other 9 with blood 
from the tuberculous carcases (of cattle) condemned as unfit 
for human food, and therefore presumably affected with 
general tuberculosis. From these considerations alone, and 
without insisting on the fact that it is not expressly stated 
that sterilized instruments were used at every step of the 
operations, the entire experiments of Jeanneland Galtier, and 
in part those of Toussaint ought to be eliminated from M. 
Butel’s table. Unfortunately, I am unable to the give detailed 
report of the 16 experiments by Villemin and Gosselin, but 1 
think it is highly probable that they also are open to one or 
other of these objections. 
It is worthy of note that Professor Bang’s experiments 
are expressly stated to have been made with blood from “ ex¬ 
tremely tuberculous cows,” several indeed having had lesions 
indicating a generalization of the disease. And if, for the 
reason already given, we put aside the positive result obtained 
in the case of the cow that was the subject of acute miliary 
tuberculosis, out of 36 rabbits and 2 guinea-pigs inoculated 
with relatively very large doses of blood only 1 rabbit was 
found to be infected, and in it the lesions were insignificant. 
Considering that the other rabbit used in the same experi¬ 
ment remained healthy, Professor Bang would probably him- 
