Commission Report: Tuberculosis, 23 
thus distributed to various parts of the country; also to herds 
from which members are exhibited at fairs and exhibitions: and 
herds which keep males for custom service. 
In addition to these herds of pure bred cattle there are many 
others to which well bred stock has been added for the purpose 
of grading uv and improving the quality of the individuals of 
the herd. 
These in some instances have received the infection of tuber- 
culosis with the new animals from which such great benefits 
had been expected, and these herds of well graded cattle should 
also be regarded with suspicion until they have been proved to 
be free of tuberculosis. Next in order should come all: dairy 
cattle, but the methods by which the disease may be located in 
these herds has been disctissed above. 
(Signed) Jonn R. Mouter, Chairman. 
J. W. FLAVELLE. 
C. A. Hopcerrs, 
Appendix C. 
REPORT OF COMMITTEE ON DISSEMINATION OF 
BOVINE TUBERCULOSIS. 
The subcommittee on the dissemination of bovine tuberculosis 
respectively submits the appended report on the means for tlie 
dissemination of this disease, based on the present knowledge 
of the life history of the tubercle bacillus. The possible means 
for the dissemination of this disease are enumerated as follows: 
“a. The introduction into a sound herd of an animal or animals 
affected with tuberculosis (a) those with open tuberculosis (b) 
those in which the disease is in a period of incubation and (c) 
those in which the lesions are temporarily arrested. 
The last group will not transmit the infection speedily and pos- 
sibly may never do so. The first group is certain to spread the 
virus. 
2. By feeding calves milk, whole or separated, buttermilk or 
whey, where the milk has come from tuberculous cows. 
3. ‘By bringing cattle suffering from open tuberculosis in con- 
tact with healthy ones at fairs, cattle shows and other exhibitions, 
4. By shipping healthy cattle in cars not thoroughly disin- 
fected, recently occupied by tuberculous cattle. 
