TEXAS FEVER. 
109 
severely, he was also inoculated with large doses of infected 
blood from a Texas cow. A dose of 7.5 c.c. was given June 
15th, and a second dose of 10 c.c. August 4th. * Daily tempera¬ 
ture records were kept and during this time no rise of tempera¬ 
ture indicating a fever period was shown. The blood was tested 
from time to time by means of the hsematokrit to determine 
variation in the percentage of corpuscles; but little variation 
from the normal was observed. The bull appeared to be in per¬ 
fect health during the entire season. A picture of this bull as 
he appeared at the close of the experiment is shown on page 15. 
Bull No. 8 was shipped to Texas, December 28, 1898, and 
has been exposed to the natural infection on a pasture at College 
Station since January 1, 1899. This animal has remained in 
perfect health throughout the season. Temperature records 
and blood examinations were made twice a week. 
Bull No. 9 was not reinfested the third season, but was 
killed March 20th, for a class demonstration, as the calf was 
affected with “ Hoose,” “verminous bronchitis.” The post¬ 
mortem showed the parasitic worms of the disease almost plug¬ 
ging many' of the small bronchi. 
Another group of Jersey bulls (Nos. 15, 16, 17, 18, 19, 20 
and 21) were infested with Texas fever ticks September 23, 
1898. From 50 to 100 ticks were applied to each, and they 
matured on all the bulls. Four of the bulls showed scarcely any 
rise of temperature, while three showed more or less fever. All 
the latter had diarrhoea, no doubt in part due to change of food, 
from early weaning. No. 19 was quite sick, had bloody diar¬ 
rhoea, but recovered. One, No. 18, died from scours, January 
16, 1899, 115 days after the infestation ; the post-mortem showed 
no evidences of Texas fever. All the other calves passed the 
winter safely, and, with the exception of No. 20, were well in¬ 
fested the following season, Aug. 1st to Oct. 15, 1899. No. 20 
died from some unknown cause in the spring of 1899, after 
being put on pasture. As this death occurred before any of the 
calves had been reinfested and the pasture was shown to be free 
from ticks, the death could not have been due to Texas fever. 
