TRANSMISSION OF TUBERCULOSIS THROUGH MEAT AND MILK. 629 
udders, but attention is invited to the fact that the milk of cows 
with healthy udders is in a large number of cases infectious for 
animals. 
Ernst 10 reports that out of 88 guinea-pigs inoculated from 
15 cows, 12, 13.6 per cent, became tuberculous ; of 90 rabbits, 
6, 6.6 per cent, became tuberculous. 
Hirshberger 17 produced tuberculosis in 14 out of a number 
of rabbits inoculated with the milk of 29 tuberculous cows with 
sound udders. 
Bang 16 by inoculation of guinea-pigs and rabbits found the 
milk of 9 out of 63 cows with apparently healthy udders infec¬ 
tious. On microscopic examination post-mortem 3 of these 
cows showed slight udder lesions. 
Peuch 19 produced tuberculosis in all four rabbits inoculated 
:rom the milk of a cow with tuberculous udder. A two-month- 
Dld pig fed five days with 4^ quarts of milk from the same 
idder did not show any lesions of tuberculosis when killed 56 
lays later. 
Ravenel- 0 experimented as follows 1 Eive grade cows which 
lid not show udder infection were selected and 10 cc. of the 
nilk of each was at different times inoculated into the peri- 
oneal cavity of 88 guinea-pigs, of which 11, 12.5 per cent., be- 
.ame tuberculous. No preparation of the milk was made, but 
t was taken just as it came from the cow. In another series 
)f 52 guinea-pigs given the whole unprepared milk of the entire 
lerd of 5 cows no tuberculosis developed. 
Russell 21 inoculated 17 guinea-pigs with 0.5 cc. to 4.0 cc. 
>f milk of 7 different tuberculous cows, only 1 of which showed 
uberculosis of the udder. The 2, 11.8 per cent., of these 17 
guinea-pigs which were inoculated with the milk of the cow 
nth tuberculous udder developed well-marked tuberculosis, al- 
hough only 2.0 cc. and 1.0 cc., respectively, of milk was used. 
Delepine 2 2 injected the sediment obtained by centrifugation 
f samples of country and town dairies into the subcutaneous 
issues or the peritoneal cavity of 65 guinea-pigs and produced 
uberculosis in 1 of them, 0.15 per cent. 
