HOW WILL ERADICATION OF CATTLE TICK BENEFIT VETERINARIANS? 159 
series of forms in the blocd. Theobald Smith found in the red 
globule, and attached to its margin, a pale round body, 0.5 mi¬ 
crons in diameter, and staining freely in alkaline methylene blue, 
in other basic analine dyes and in hemotoxylin, but not in acid-col¬ 
oring fluids. These were found in acute cases, often in company 
with the pear-shaped bodies, and usually in the absence of the 
piriform bodies in chronic cases. The red cells containing these 
rounded organisms were not cremated or distorted, though 50 
per cent, of them might contain the parasite. He looked on 
these as the earlier stage of the organism, which later developed 
into the piriform body, by segmentation of its substance. The 
piriform bodies were usually found in pairs, connected at their 
pointed ends by a filament and extending across nearly the whole 
breadth of the red globule. 
Incubation .—Outbreaks occurring in the North, in herds 
into which southern infected cattle have been brought, were at 
first held to indicate an incubation of 30 or 40 days (or even 
sometimes 65 days), but this is now explained for the time re¬ 
quired for the laying and hatching of the eggs of the mature 
ticks and the evolution of infecting young larvae or seed ticks. 
The actual incubation as shown by the subcutaneous or intra¬ 
venous injection of the blood of an infected ox extends from 3 to 
10 days. 
Symptoms (Acute Type ).—The first symptom is a rise of 
temperature, and this may last two or three days before other 
morbid phenomena are noticed. It may rise to 104 F. in the first 
day and later to 107 or 108 degrees F. The more acute the case 
and the hotter the weather the greater the rise. The tempera¬ 
ture often rises from 2 to 4 days, and then suddenly drops, with 
the occurrence of collapse and imminent death. After two or 
three days the respiration becomes accelerated to 60 to 100 per 
minute and the pulse to 90 to 100 or more. There is complete 
loss of appetite and rumination after the development of these 
symptoms, the mouth is hot, and it may be dry, the muzzle dry, 
the head pendant, the eyes dull or semi-closed and congested 
(usually icteric), the bowels confined, to be relaxed again as the 
