TUBERCULOSIS 
537 
dence of disease was manifested in his stock until the year 1883, 
when a cow, recently purchased, dropped a bull calf and then 
gradually failed until she died, and an examination showed the 
lesions of general tuberculosis. In 1885 this bull was killed, and 
an examination presented the same lesions as found in his dam. 
From that time the malady steadily gained ground, until, in the 
spring of 1887, all the cattle on the farm, with a few exceptions, 
had been killed or otherwise disposed of, and the barn was then 
fumigated. Not suspecting that this trouble was infectious, new 
animals were added to the herd after killing the bull, in 1885, 
and in one instance a bull was bought in November, 1886, and in 
June, 1887, he was killed, and the post-mortem showed the 
lesions of the disease. This bull came from a farm where tuber¬ 
culosis had never been known to exist. Thinking that the disin¬ 
fection of the barn had been such as to remove all traces of the 
disease, Mr. Rogers, in May, 1888, purchased in Vermont six 
cows that were healthy and from a farm where tuberculosis was 
not known to exist, and put them in the barn from which he had 
taken the diseased animals. In December, 1888, only two of 
these animals remained in an apparently normal condition ; the 
others, having developed the symptoms of tuberculosis, had been 
taken away. The forty-four animals on the farm, including the 
six from Vermont, had been killed or otherwise disposed of. 
In December, 1884, five Guernsey cows were brought to the 
farm of Mr. F. L. Ames in North Easton, and in August, 1885, a 
bull of the same breed. During the winter of 1887 this bull began 
to fail, and in April of that year he was examined by Dr. J. S. 
Saunders of Boston, and the diagnosis of tuberculosis was made, 
when he was killed, and the autopsy showed the lesions of tuber¬ 
culosis with phthisis. 
In May of the same year, after an examination of the herd 
(thirty-six animals) by Dr. A. Peters of Boston and myself, ten 
mature animals and four calves were killed. Six of the cows 
were Ayrshires, and the others Guernseys. The calves were 
killed as they were sired by the bull killed in April, and the 
others as they presented symptoms of tuberculosis, which were 
sustained by the post-mortems. The following December, four 
