TEXAS FEVER. 
101 
Ill 1898, all the above except Nos. 4, 6, 11 and 12 were re¬ 
infested and the following animals were added to the experi¬ 
ment : 
No. 13.—Holstein heifer “ Bessie,” 10 months old. 
No. 14.—Holstein heifer “ Beauty,” 10 months old. 
No. 15.—Jersey bull calf, 4 weeks old. 
No. 16.—Jersey bull calf, 2 weeks old. 
No. 17.—Jersey bull calf, 3^ weeks old. 
No. 18.—Jersey bull calf, 5 weeks old. 
No. 19.—Jersey bull calf, 3 weeks old. 
No. 20.—Jersey bull calf, 5 weeks old. 
No. 21.—Jersey bull calf, 3^ weeks old. 
In 1899, s ^ x animals of the first group (Nos. 1, 2, 3, 5, 7 and 
8), were reinfested for a third season.* In the second group 
Nos. 13, 13, 15, 16, 19 and 21, were reinfested a second season, 
and all have lived. 
Certain individuals and groups in the above lot of animals 
were treated differently ; some were grossly and continuously 
infested, while others were but slightly or intermittently in¬ 
fested. It will be of interest to notice briefly these individual 
cases and groups. 
TICK-INFESTATION OF YEARLINGS. 
No. 1, “Jerry,” was infested July 27, 1897, with several 
hundred fever ticks. These had nearly all matured and fallen 
off by September 1st. The steer remained free from ticks for 
about a month, and was again reinfested with several hundred 
more ticks. In addition the steer became grossly reinfested 
from the pasture. An acute attack of the fever resulted from 
the first infestation ; the morning temperature on the twelfth 
day after infestation was 105 F. and continued high for four 
days when it fell to normal. The afternoon temperature during 
this period ranged from 105 to 107 B A . The steer fell off some 
* All of these except No. 7*, were shipped to the Texas Experiment Station, where 
they have been on infected grounds since January 1st, without showing any signs of fever. 
Temperature records and blood examinations were made twice a week. No. 7 was 
kept at the Missouri Experiment Station and given a severe test without showing any 
fever. See cut p. 15. 
