Cattle Ticks and Texas Fever 
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138. 
Babesia bovis in blood corpuscles 
After Calli. 
they were given the generic name Pyrososma and because they were 
usually found two in a corpuscle, the specific name, bigeminum. It 
is now generally accepted that 
the parasite is the same which 
Babes had observed the year 
before in Roumanian cattle 
suffering from haemoglobinuria, 
and should be known as Babesia 
bovis (Babes). 
By a series of perfectly con¬ 
clusive experiments carried on 
near Washington, D. C., Smith 
and Kilboume showed that 
this organism was carried from Southern cattle to non-immune ani¬ 
mals by the so-called Southern cattle 
tick, Boophilus annulatus (= Mar- 
garopus annulatus) (fig. 139). 
Of fourteen head of native cattle 
placed in a field with tick-infested 
Northern cattle all but two contracted 
the disease. This experiment was 
repeated with similar results. Four 
head of native cattle kept in a plot 
with three North Carolina cattle 
which had been carefully freed from 
ticks remained healthy. A second 
experiment the same year gave similar 
results. 
Still more conclusive was the ex¬ 
periment showing that fields which a. 
had not been entered by Southern 
cattle but which had been infected by 
mature ticks taken from such animals 
would produce Texas fever in native 
cattle. On September 13, 1889, sev¬ 
eral thousand ticks collected from 
cattle in North Carolina three and 
four days before, were scattered in a 
small field near W ashington. Three 139 . Thecattietick(Boophiiusannuiatus). 
out of four native animals placed in comftoTk! 61 {b) ma!e ‘ Atter 
