24 Commission Report: Tuberculosis. 
3. By placing healthy cattle in stables that have not been thor- 
oughly disinfected and which were recently occupied by tubercu- 
lous animals, as frequently happens with the change of farm own- 
ership or tenants. 
6. Tuberculous animals which do not react to tuberculin, such 
as those in the period of incubation or latent cases, but which 
develop active tuberculosis later, are frequently carriers of the 
virus although bought and sold as sound animals. These can 
not at present be differentiated from sound animals. Therefore 
all cattle coming from herds in which the disease exists should be 
considered as suspicious. The sound herd is the unit to deal with. 
7. Tubercle bacilli may be transmitted by tuberculous cattle 
running in a pasture to healthy cattle in adjoining pastures where 
they are separated by a fence of such nature that the cattle may 
get their noses together. i 
8. Tuberculosis in cattle rarely, if ever, occurs through infec- 
tion from (a) man, either directly or as a carrier of bovine tubercle 
bacilli, (b) from other species of animals, or (c) by infection 
from the droppings of crows, buzzards or other birds or carnivo- 
rous animals that have fed upon the carcasses of tuberculous cattle. 
It is the opinion of this committee that bovine tuberculosis is 
spread largely through the introduction of tuberculous cattle into 
sound herds; by the feeding of calves with infected milk, or milk 
products; by exposing sound animals to infected ones at fairs, or 
other cattle shows; and by exposing them to infected cars and 
stables. There are other ways in which now and then it is ‘pos- 
sible that an animal may become infected but the means.of dissem- 
ination mentioned in this paragraph are those to be guarded 
against in formulating efficient methods of control. 
(Signed) V. A. Moore, Chairman. 
E. C. ScHROEDER. 
M. P. RavENeEL,. 
Appendix D. 
REPORT OF COMMITTEE ON DISPOSITION OF TUBER- 
CULOUS ANIMALS. 
Your committee on the Disposition of Tuberculous Animals 
begs to submit the following report: 
In the work of control and eradication of tuberculosis in ani- 
mals it is first of all of the utmost importance to establish the 
