162 
J. W. CONNAWAY. 
ORIGINAL ARTICLES. 
TEXAS FEVER. 
EXPERIMENTS MADE BY THE MISSOURI EXPERIMENT STATION 
AND THE MISSOURI STATE BOARD OF AGRICULTURE, IN CO¬ 
OPERATION WITH THE TEXAS EXPERIMENT STATION, IN 
IMMUNIZING NORTHERN BREEDING CATTLE AGAINST TEXAS 
FEVER FOR THE SOUTHERN TRADE. 
By J. W. Connaway, Veterinarian Missouri Experiment Station, 
and M. Francis, Veterinarian Texas Experiment Station. 
(Continued from page 112.) 
III. EXPERIMENTS ON IMMUNIZING NORTHERN CATTLE 
AGAINST TEXAS FEVER BY INOCULATION 
WITH INFECTED BLOOD. 
In the following section a report is given of the inoculation 
of over four hundred registered breeding cattle raised north of 
the Texas fever quarantine line, and shipped into infected terri¬ 
tory in the State of Texas. 
As stated in the introductory section Texas fever can be 
induced artificially in northern raised cattle by hypodermic in¬ 
jection of blood from immune southern cattle. This discovery 
was made by Drs. Smith and Kilbourne, in their classical in¬ 
vestigations into the pathology of Texas fever.* In the course 
of these investigations it was observed that the attack induced 
in this artificial way “ was not so fatal as the natural disease ” ; 
and the suggestion was made that by further experimentation 
a practical method of preventive inoculation might be perfected. 
Recent experiments in Australia, where the “fever tick ” is 
gradually spreading over the country on account of the mildness 
of the climate, show that preventive inoculation by means of 
infected blood has met with great success as a defensive measure 
on the cattle ranges of that country. Moreover that the method 
* Bulletin No. 1 Bureau of Animal Industry and Reports of C. J. Pound, director of 
Queensland Stock Institute, and Dr. J. Sidney Hunt, Government Pathologist, Queens¬ 
land. 
