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Chronic Form .—Follows the acute attack, when 
the dog does not die or quickly recover. It is 
characterised by (1) Extreme anaemia ; (2) Emaciation ; 
(3) Weakness and anorexia. Haemoglobinuria and 
icterus are not seen unless, as sometimes happens, an 
acute attack supervenes after partial recovery. The 
temperature is variable. All grades of severity of 
attack are seen, and the types acute, chronic and 
latent cannot be very clearly defined. 
"Recovered animals remain infective for a long 
time, and shew scanty parasites. 
Blood Examination .—Snip the extreme point of 
the ear with a sharp scissors, or in large dogs shave 
the posterior border and prick with a needle. 
Parasites appear first about the fifth or sixth day 
after subcutaneous inoculation, and earlier in the case 
of intravenous inoculation. After the bite of infected 
ticks they may be seen as early as the fourth day or 
as late as ten, fifteen or twenty days after. They are 
abundant in the acute disease, except after a crisis, 
but scanty in the chronic. They may be abundant at 
the outset though there are few symptoms. 
Intracorpuscular forms are (1) Pyriform or oval; 
(2) Round ; (3) Irregular (amoeboid), and many shew 
pseudopodia which may be short and thick or very 
fine resembling flagella (Plate III). 
During growth the parasite is amoeboid, and 
commonly they stretch themselves nearly across the 
corpuscle. Division occurs either by the parasite, 
when in an extended position, becoming constricted in 
the middle; or by an amoeboid form dividing into 
two pyriform halves, each half carrying with it a 
portion of the chromatin. In this way result two, 
four, eight, sixteen and even thirty-two parasites in 
a corpuscle. . Single and double forms are. always the 
