176 
complete precautions into liter flasks and immediately cooled. The , 
cream rose during transportation and was pipetted off, and to it was j 
added enough of the milk to make 80 cubic centimeters. This mix- I 
ture was then centrifuged, and a mixture of cream, skim milk, and 
sediment injected into guinea pigs. Three or four animals were 
injected with 10 cubic centimeters of each specimen. Each specimen 
was also examined microscopically for the presence of tubercle bacilli 
and the remainder was fed to guinea pigs. 
Tubercle bacilli were not found in any specimen of the milk by 
microscopic examination. No pseudo-tubercle bacilli were found. 
Only 1 animal contracted tuberculosis out of all those injected, rep- 
resenting 1 specimen of 19. The other 3 animals receiving this same 
milk remained healthy and proved normal on section. The authors, 
for reasons which they give, do not regard this one case of tubercular 
infection as being due to the milk. They conclude that there were 
no tubercle bacilli in any of the 19 specimens. Fourteen specimens of 
the mixed milk from this herd were then examined. Only 11 re- ' 
mained for consideration. One of the injected guinea pigs was found 
tuberculous on being killed after sevent}'-one days, but the lesions • 
were slight and the animal had lost only 20 grams. None of the fed 
animals became tuberculous. 
Rabinowitsch, Lydia, and Kempner, Walter. Zeit. Hyg. XXXI, 1899, p. 137. 
Recalls the results of earlier experiments of Rabinowitsch, in i 
which of 25 samples of Berlin milk examined (1897), 7 (28 per cent) I 
contained tubercle bacilli. The milk was centrifuged and a mixture 
of the cream and sediment layers injected into the peritoneum of 
guinea pigs. 
The present article deals with an examination of the milk of cows 
reacting to tuberculin. Of 14 such cows, 10, or 71.4 per cent, gave 
milk containing tubercle bacilli. The condition of these cows is here 
detailed: Only 1 had pronounced udder tuberculosis. Another had 
udder tuberculosis demonstrable only histologically. Three cows 
with advanced generalized tuberculosis gave histologically the picture 
of chronic interstitial inflammation of the udder. One cow had low 
grade tuberculosis. One had rales on one examination, but none on 
the next two. Two cows had no symptom of tuberculosis. Another 
showed symptoms of beginning tuberculosis only on the second and 
third examinations. 
This demonstrates that in beginning tuberculosis without discov- 
erable udder disease, and in latent tuberculosis demonstrable only by 
the tuberculin reaction, the tubercle bacilli may be present in the 
milk. They believe that repeated examination would have shown 
tubercle bacilli in the milk of more of these cows. 
