628 
JOHN J. REPP. 
food organs or tissues in slaughtering or dressing. We have no 
evidence to show that the food parts of these mild, localized 
cases would be unsafe for food purposes if the non-food organs 
and tissues and all tuberculous food tissues were removed at the 
time of slaughter, provided that no contamination by smearing 
would take place. 
It is well known that heating to a temperature of 158° F. 
and maintaining the temperature at this point for 15 minutes 
will devitalize the tubercle bacillus. With this in view we are 
led to say that thorough cooking will render inert any tubercle 
bacilli which may be in any way connected with a piece of meat. 
But the cooking must be so thorough as to subject the interior 
of the piece of meat to this heat for this length of time. Tous- 
saint 3 found broiled steak infected after heating its interior to 
176° F. It is presumed that he did not maintain this heat long 
enough. Woodhead 14 found that rolls of meat weighing over 
4 pounds which he had smeared with tuberculous matter were 
not sterilized by ordinary roasting and boiling. 
Johne 15 in 62 experiments administered notoriously tuber, 
culous flesh after it had been submitted to cooking in boiling 
water for ten to fifteen minutes, and 35.5 per cent, of the ani¬ 
mals became affected. 
B. By Milk . 
This will be understood to mean milk and all of its products, 
as : skim milk, buttermilk, cream, butter and cheese. The right 
is reserved to refer to any of these products as milk. The num¬ 
ber of experiments and observations showing that tuberculosis 
may be transmitted from animal to animal of the same or dif¬ 
ferent species through the medium of the milk of tuberculous 
cows is very great. In order to reinforce the assertion by the 
facts in the case a number of experiments and observations will 
be presented. 
7. By Artificial Methods. 
There is no attempt made in the following presentation to 
separate the experiments made with milk of cows with healthy 
udders from those made with the milk of cows with diseased 
