112 STORRS AGRICULTURAL EXPERIMENT STATION. 
test which was made December 22-23, after it had been feeding 
upon the milk of its dam for nearly four months. 
Feeding calf H.— This was a strong, vigorous heifer calf, 
dropped by cow No. 1337, September 14, 1898. The calf has 
suckled its dam for the past four months, and has grown 
rapidly. It was tested with tuberculin December 22-23; 108, 
but gave no response. At the present time (February, 1899), 
this calf is a large, vigorous animal, and is growing rapidly. 
DEDUCTIONS. 
We know comparatively little regarding the conditions 
which favor the spread and development of tuberculosis among 
animals or man. Most of all are we lacking in a definite knowl- 
edge of the dangers of this disease to mankind from the bovine 
race. Many have claimed that the danger to mankind from 
the spread of the disease through the milk supply is very great. 
It has generally been thought that one great cause for the 
spread of the disease among our herds is the feeding of the 
milk of tuberculous cows to calves. The experiments made 
during the past two years at this Station do not substantiate 
this view. It must be borne in mind, however, that the num- 
ber of experiments is comparatively few, and that the cows 
whose milk was used were probably in the earlier stages of the 
disease. These facts have been carefully considered, and it is 
of course unwise to attempt to draw any definite conclusions 
from the work, but the following deductions seem warranted: 
(7) Bovine tuberculosis is usually a disease of slow develop- 
ment, its progress depending gutte largely upon the general vigor of 
the animal and its power to resist the action of the germs. In 
nearly two years and a half that the tuberculous cows have been at 
the Station, only one secondary case has appeared, and this was dis- 
covered about six months after the feeding period with milk had 
ended. 
(2) Ln the experiments here reported, eight calves have been fed 
upon the milk of tuberculous cows for pertods varying from three 
months to stxteen months without developing the disease. 
(3) The results of these experiments coincide with the Lene- 
ral results of European observations, and indicate that the danger . 
Srom the spread of tuberculosts through the milk of cows to man or 
to other animals ts not as great as has generally been supposed. © In 
the earlier stages of the disease and at all times when the udder ts 
not affected, the danger from the use of the milk ts guite limtted. 
Great stress, however, should be laid on the danger of using mtlk 
from cows which show any symptoms of udder affection. 
