TUBERCULOSIS OF ANIMALS. 
135 
Johne has studied the effect upon meat infiltrated 
th tuberculous substance, of immersion in boiling water 
r a period of ten or fifteen minutes, and as the result of 
;ty-two experiments concludes that it diminished the 
wer of infection through the digestive canal by one- 
lf. That is, while thorough and perfect cooking may re- 
ove the danger of tuberculization, it is reduced by only 
y per cent, when the point of the coagulation of the albu¬ 
rn of the juice has not been reached in every part of the 
bat. 
We will now, if you please, make some calculations which 
; 11 enable us to form a more precise idea of the danger re¬ 
nting from the use of tuberculous meat, bearing in mind at 
!3 same time all the circumstances and conditions by which 
is likely to be modified or diminished, and carefully avoid- 
r any exaggeration of results in favor of our own convic¬ 
ts, but making rather every possible concession and allow- 
ice to the claims of those who holds views adverse to our 
im, and when necessary averaging fairly any extremes or 
versities of fact which mav be discovered in the calculations. 
We remember that out of 137 guinea pigs inoculated with 
ix. of the juice of suspected meat, 13 became tuberculous, 
e have shown that 100 grammes of pressed meat give 30 
ammes of juice. Therefore 450 or in round numbers 500 
ammes of meat were employed to inoculate 137 guinea 
js, and consequently a tuberculous steer, furnishing 380 
os of meat, could infect 600 times 13 guinea pigs—say 7,800. 
I however, the infection by ingestion gives only 11.8 per 
:nt. of positive results, the 7,800 will then be reduced to 920. 
nd again, as cooking reduced the chances of infection by 
: e-half, the number of guinea pigs tuberculized b} T the meat 
: a tuberculous steer will be 460. 
Let us consider further: At Lyons where 50,000 cattle 
is annually slaughtered, 5 per 1,000, or 250, are tuberculous, 
hen, as according to our statistics, the experiments on the in_ 
btiousness of muscular juice are positive in one-fifth of the 
:ses experimented upon, we will then admit that out of 
te 250 steers 50 only are dangerous. Consequently the an- 
