106 
J. W. CONNAWAY. 
sudden gross infestation on a young animal. The number of 
ticks applied was doubtless far greater than would, under nat¬ 
ural conditions, infest an animal at one time. On the morning 
of August 6th, nine days after infesting, the calf had a tem¬ 
perature of 106.2 F. On the following day, 107.2 F., and death 
resulted August 10th, thirteen days after the ticks were applied. 
A post-mortem showed lesions of Texas fever. This ex¬ 
periment shows that sucking calves, which ordinarily are quite 
resistant to the disease, may succumb if excessive infestation 
occurs. 
In the fall of 1897, six young Jersey bull calves, 2 to 6 
weeks old (Nos. 7, 8, 9, 10, 11, 12), were put in a quarantine 
pen and infested artificially with from 25 to 50 Texas fever 
ticks. After these had matured and dropped off, the calves 
were infested again with from 75 to 200 ticks. These also ma¬ 
tured. Some of the calves for a short time were off feed and a 
little dull and gaunt, but at no time during the infestation 
period was any seriously sick. The thermometer showed some 
fever in each calf. This, however, was of short duration and 
of mild character. From fear of carrying the infection into the 
barns, these calves were kept in the quarantine pens somewhat 
late in the season, and were exposed to a few sharp winter 
storms, from which they all suffered severely, and two (Nos. 11 
and 12) died. The post-mortem showed no indication of 
Texas fever. The four remaining calves were put in the barn 
December 12th, and in a few weeks were in excellent condition. 
These calves were infested again the following summer, after 
they had been free from ticks seven months. Bull No. 7 was 
infested July 28, 1898, with about 400 ticks. July 7th, bull 
No. 8 was infested with 300 ticks, and again on July 7, with 
100 more. Bull No. 9 was infested July 7, with 100 ticks, and 
again September 10th, with 500. Bull No. 10, with 200 ticks 
011 July 28th, and again on September 10, with 500. The first 
crop of ticks matured without any of the bulls showing a fever 
period, only an occasional high temperature was noted on very 
warm days. On the 28th of August, No. 10, after becoming 
