HOW WILL ERADICATION OF CATTLE TICK BENEFIT VETERINARIANS? 161 
excited, may terminate in death in from 24 to 48 hours. More 
commonly death will take place in from 4 to 7 days. Some pa¬ 
tients survice longer, but owing to the extraordinary loss of blood 
globules and the lesions of important solid tissues they are unable 
to rally, become steadily weaker and perish in from 3 weeks to 
3 months. Such animals are pale and bloodless, weak in their 
limbs, careless of food and increasingly emaciated. The pulse 
is weak and irritable and the eyes sunken. 
In cases of recovery there remains for a month or more an 
unnatural pallor, with marked loss of condition and weakness, 
which are only gradually overcome. Convalescent animals are 
liable to die of indigestion when overfed. ■ 
Mortality averages not less than 90 per cent, in susceptible 
mature animals from a healthy district in the hot season. Later, 
from October onward, the tendency is toward a milder type of 
the disease and a greater ratio of recoveries. 
Mild Type .—This is seen mainly in cattle indigenous to the 
Texas-fever district in suckling calves. It can be produced at 
will by placing a limited number of ticks (5 to 20) on the skin 
of susceptible cattle, especially in the cool season. Again, it 
occurs as a relapse in cattle that have survived an attack earlier 
in the season. 
In mild cases the temperature does not arise above 105 de¬ 
grees F. There is loss of appetite, dullness, languor, costive¬ 
ness, scanty urine (albuminous, but not hemoglobinuria), pallor 
of the mucosa and marked loss of condition. Examination of 
the blood shows the presence of the parasite in the red globules, 
but usually in the coccus or round form only. 
Pathological Changes .—Upon cutting into the hide and skin¬ 
ning the carcass, marked lack of blood in the bloodvessels and 
underlying tissues is observed. Occasionally there may be no¬ 
ticed a jaundiced discoloration of these tissues. The fatty tis¬ 
sues are also yellowish and are soft and oily. 
Probably the most marked pathologic alterations in the dis¬ 
ease are found in the liver. This organ is very much enlarged 
and has a yellowish, mahogany-brown color, due to the bile it 
