TRANSMISSION OF TUBERCULOSIS THROUGH MEAT AND MILK. 631 
duced the disease in these 2 guinea-pig's did not develop the 
disease. 
The work of Rabinowitch and Kempner 31 is very interest¬ 
ing as adding strong evidence to that already obtained of in¬ 
fectiousness of milk of tuberculous cows, even though the udder 
be sound. The experimenters used the milk of 15 cows which 
had leacted to the tuberculin test, in 10 of which the milk was 
found by inoculation of guinea-pigs to be infectious, 66f per 
cent. Of the 10 cows 1 showed clinical evidence of udder tu¬ 
berculosis and another showed it on microscopic examination 
post-mortem. Two other cows were only slightly affected as 
determined by clinical examination, and still two others showed 
no symptoms of the disease. The inoculations were made into 
the peritoneal cavity with a combination of the sediment, ob¬ 
tained by centrifuging, and the fat layer. Butter was made 
from the milk of 1 of these 10 cows, and by inoculating guinea- 
pigs with it tuberculosis was set up in 3 out of 4 guinea-pigs 
inoculated, 75 per cent. 
Obermiiller 3 2 reports that Brusaferro has obtained positive 
results with 9 samples of butter; Bang from 1 specimen from a 
tuberculous cow ; Roth from 2 out of 20 samples from diseased 
cows and from the market. He also reports that as a result of 
his own experiments he succeeded in producing tuberculosis in 
4 out of 41 guinea-pigs inoculated from 10 different samples of 
butter. 
Hormann and Morgenroth 33 examined 10 samples of butter, 
using the method of intraperitoneal inoculation of guinea-pigs. 
The samples contained true tubercle bacilli as proven both by 
lesions produceu and by cultures. 
By Natural Methods . 
t Gerlach 3 4 fed young animals, calves, pigs, rabbits, etc., with 
milk taken from tuberculous cows, and found that some of them 
grew thin and died at the end of a few months, showing at the 
autopsy an intense tubercular infection of the organs of the ab¬ 
dominal cavity. 
Bang 3 5 reports autopsy on 34 milk-fed calves, 24, 70.6 per 
