171 
Five cubic centimeters each of 40 specimens were injected intra- 
peritoneally into rabbits. Seven specimens excluded by early death 
of the animals. No tubercle bacilli were demonstrated in any of the 
remaining 33 specimens, although in one instance the findings were 
extremely suspicious. Consequently the country milk is regarded as 
being much freer from tubercular infection than the town milk. 
Also a much smaller percentage of animals died of peritonitis when 
injected with the country milk. 
Schroeder, E. C. Further experimental observations on the presence of tu- 
bercle bacilli in the milk of cows. Bulletin No. 7, B. A. I., Agric. Dept. 
1894, p. 75. 
1. Samples of mixed milk from dairies. Forty cubic centimeters of 
milk centrifuged, 5 cubic centimeters of sediment layer injected into 
the peritoneum of guinea pigs. Other pigs inoculated with 5 cubic 
centimeters of the whole milk. Of 19 specimens, 1 apparently con- 
tained tubercle bacilli as the animal receiving the whole milk died 
of tuberculosis. Its companion getting the centrifuged sediment 
remained normal. 
2. Samples of milk from tuberculous cows diagnosed clinically or 
by tuberculin. Milk of 12 such cows injected into guinea pigs. Only 
1 showed tubercle bacilli. 
3. Repeated injections into the same guinea pig of milk from the 
same tuberculous cow not having udder tuberculosis. Four such 
cows used, from 2 to 7 pigs receiving several injections of the milk 
of the same cow. None of the pigs became tuberculous. 
The author concludes that careful inspection of all dairy herds, 
which has for its object the detection and removal of all advanced 
cases of tuberculosis, and especialh^ of cows with diseased udders, 
would probably exclude the sale of most infected milk. 
Ernst, H. C. Article on The Infectiousness of Milk, Boston, 1895. Pub. by Soc. 
for Promoting Agriculture. 
Modifies the statements of results made in a former article which 
was published before the completion of the experiments. 
A. Milk from cows having tuberculosis, but healthy udders. 
1. Cover-glass examinations. Thirty-six cows examined; tubercle 
bacilli in milk of 12 (33.33 per cent). 
2. Subcutaneous inoculation of guinea pigs. Eighty-eight guinea 
pigs inoculated; 12 became tuberculous. Fifteen cows examined; 
tubercle bacilli in milk or cream of 6 (40 per cent). 
3. Subcutaneous inoculation of rabbits. Ninety rabbits inoculated ; 
6 became tuberculous. Nineteen cows examined; tubercle bacilli in 
milk of 4 (21 per cent). 
