_ A ™ ACTICAL USE ON GUTTAPERCHA IN VETERINARY DENTAL SURGERY. 623 
- IfSouthern ca ttle are driven through the country that is not 
■nfected, they lose the power to infect, as all the mature ticks 
will chop off in about four weeks, leaving the Southern cattle 
harmless; but should susceptible cattle follow the trail three or 
four weeks after the Southern cattle, there would be a .rood 
many cases of Texas fever. If Texas cattle and susceptible 
cattle are placed together, the natives will not contract Texas 
ever under about four weeks, as it will take about that time 
01 t e adult ticks to lay their eggs and have them hatched 
out. 
Sick natives may be a source of infection, when ticks are 
present. Other means have been tried to inoculate susceptable 
cattle, such as feeding animals on ground ticks, spleen pulp and 
on grass, where ticks were known to exist, but all failed. A few 
other animals beside cattle have been tried, but proved insus¬ 
ceptible to the disease by direct inoculation ; sheep for one, as 
they take after cattle somewhat, normal temperature' of cattle 
ioi°F., respiration, 18 to 30, according to temperature of air and 
age of animal, pulse from 55 to 70. 
Inspection —The Bureau of Animal Industry has been very 
successful in preventing Texas fever from spreading over the 
country, where susceptible cattle are. Inspectors are placed at 
1 erent stations on the line of the infected districts to see that 
all cars are marked Southern cattle, also to see that cattle from 
infected districts are not driven into the territory not infected. 
When Southern cattle arrive at destination, they are held in 
quarantine yards; the cars then taken to a station to be thor¬ 
oughly cleaned and disinfected in the presence of an inspector. 
Any out-breaks that may occur are reported and taken care of 
in a way to prevent any spread if possible. 
I think great credit is due Dr. D. E. Salmon, who is chief of 
the Bureau of Animal Industry, for his untiring efforts in ferret¬ 
ing out the cause of diseases and the prevention of the same. 
Parts of this article are from reports of the Bureau of Animal 
Industry, and the rest from practicable observations at the 
packing houses. 
