EXPERIMENTS WITH TUBERCULOUS COWS. 181 
or when made to exercise vigorously. This cow produced a 
vigorous calf in December, 1899; the calf was soon after at- 
tacked by a mild case of scours, from which it recovered ina 
few days. Cow No. 1344 gave a fair flow of milk during the 
early part of 1899 and seemed to be in a vigorous state of 
health. Sometime during the summer of 1899 she showed 
lameness in the stifle joint of the right hind leg, but this 
gave her little trouble. This cow calved in October, 1899; 
the calf was weak at birth and refused to eat. It died about 
a week after birth. The cow gave a good flow of milk for 
several months after calving, but was thinner than usual. 
During the early part of the fourth year that the cows were 
under observation three of the four began to show marked 
signs of decline. Cow No. 1337 remained in a good state of 
flesh, had a sleek coat and continued to give a good flow of 
milk, and appeared brighter and more active than any of the 
others. ‘This cow appeared to be in a vigorous state of health 
when killed in November, 1900. Early in the year (1900) 
she developed a slight cough, but otherwise appeared to be in 
perfect health. Cow No. 1347 produced a healthy calf in Feb- 
ruary, 1900, and gave a good flow of milk for several months 
after calving; but during the spring and summer of 1900 she 
lost flesh rapidly, until her flanks were hollow and her ribs 
protruded plainly; her coat became rough, her eyes dull and 
sunken, her cough increased and her breathing was shorter 
and more frequent. She continued to scour intermittently, 
-_and when killed in November, 1900, she was generally emaci- 
ated, although continuing to give milk up to the time she was 
slaughtered. Cow No. 1343 gave a fair flow of milk during 
the early part of 1900, although she was losing flesh. During 
the spring and summer her cough increased in frequency and 
her breathing was short and hurried. During the fall of 1900 
she lost flesh rapidly, had a rough coat, sunken eyes and pro- 
truding ribs. She lost her appetite and in October ceased to 
give milk, and when slaughtered in November was greatly 
emaciated. Up to within a year of the time of slaughtering 
this cow had been the fattest and sleekest of the four. During 
the early part of 1900 cow No. 1344 gave a good flow of milk, 
but rapidly lost flesh and developed a severe cough, which, 
13 
