Texas Fever 373 
days after the young ticks are established on the sus- 
ceptible cattle, the animals begin to show symptoms of 
Texas fever. Ordinarily from thirty to forty days 
elapse after southern cattle pass over and infest the 
ground, before northern cattle come down with the 
fever; but this time may be extended several weeks, 
depending on the temperature. When susceptible north- 
ern cattle are taken into southern territory that is in- 
fested by the cattle-tick, the symptoms of the fever 
usually appear in about ten days. The mortality 
from Texas fever is high, varying from twenty-five to 
ninety per cent, depending on the weather and the 
amount of infection. , 
In some regions in the South close to the quarantine 
line, Texas fever is quite common among cows that 
run at large, or on the commons. In localities farther 
north, cattle that run at large get the ticks from the 
litter cleaned from cars in which southern cattle have 
been shipped; the disease is then commonly known as 
the “town-cow disease,” but it is Texas fever. 
There is loss of appetite and suspended rumination, 
although these symptoms are preceded by a high fever, 
the temperature going as high as 105° to 108° F. 
There is great weakness and prostration as the disease 
progresses, with trembling of the voluntary muscles 
and difficulty in getting up. The head droops, the 
ears lop, the flanks are “tucked up.” There is usually 
constipation, though in some cases there is diarrhea in- 
stead. Diarrhea is considered a good symptom, as more 
of such eases recover. In milch cows, the secretion of 
milk is stopped. The urine is a dark cherry-red in 
