80 
GEORGE H. BAILEY. 
the disease, as well as to the fact that the appetite and digestion 
continue good, even when the disease is far advanced. 
If the morbific principle does not attack an organ essential to 
animal existence, the animals may render all the services of one 
which is in a good state of health : it may produce calves, fur¬ 
nish milk, perform labor, and even become fat. If the centre of 
infection is very limited, encysted, isolated, or calcified, the ani¬ 
mal will enjoy relatively good health, and perform its functions 
as if perfectly well. 
The human subject of tuberculosis on the contrary develops 
a capricious appetite and faulty digestion in a comparatively 
early stage of the disease, hence the more rapid emaciation and 
prominent objective symptoms in man. You may recollect that 
after the Orono herd had been disposed of, the question came up 
as to what disposition should be made of the bulls that had been 
sold from the herd and were then standing on farms scattered 
from the Penobscot to the Aroostook. In a letter received from 
the farm superintendent, he wrote me : “ Within the past four 
years, fourteen bull calves have been sold from the farm, and 
eleven of them came from the cows that we killef most of them 
being but a few days old when sold.” Those who professed to 
disbelieve in the heredity of the disease claimed that these young 
bulls, being then two or three years old, having gone out from 
the herd so long before the slaughter, could not possibly be af¬ 
fected ; while their environment among sound animals would be 
proof against contagion by inhalation, inoculation or ingestion. 
Dr. Michenor, Chief Inspector of the Bureau of Animal In¬ 
dustry, at Washington, who was sent on to assist me in dispos¬ 
ing of the herd, wrote me upon his return in regard to the first 
bull inspected: 
G. H. Bailey, D. V. S. : 
Dear Sir :—Your letter of 14th is rec’d. I do not see how any one can advise the 
keeping of said bull for service. 
It must be remembered that tuberculosis is held to be hereditary by all the best au¬ 
thorities, both human and veterinary. If this be true, and I believe it to be so unques¬ 
tionably^ then this particular animal is certainly an unsafe sire, or to put it differently, is a 
sire almost certain to propagate the disease. It shotild be killed. With kindest regards 
to all, I am sincerely yours, Ch. B. Michener. 
