EDITORIAL. 
G41> 
ordinary mode of development of the various stages and also be¬ 
cause of the rapidity with which the affection progresses. 
But if invariably this acute form of canine piroplasmosis ends 
in death, there are besides two other forms, which the Russian 
experimenters call sub-acute and chronic. 
The characteristic of the first is its atypic progress. The dogs 
present an identical picture as far as the march of the disease, but 
survive to the fourth period and seem to return entirely to com¬ 
plete health. Then after a length of time varying between two 
and ten days, relapse takes place with the symptoms of the sec¬ 
ond stage, in which the hyperthermy and the presence of the 
piroplasms in the blood form the principal signs. The other mani¬ 
festations are less marked. The relapse may end in death or 
again be followed by a second or a third, when, although the 
symptoms become less and less marked, fatal termination is 
nevertheless the result. The average duration of each of these 
relapses varies between three and four days. 
In chronic piroplasmose, the various stages are better defined 
than in the acute form. The duration of the febrile stage is 
short in the second and longer in the third stage. In the fourth 
stage, while the symptoms are as violent as in the acute form, 
death does not take place and the animal, gradually recovering, 
may survive. Later the animal affected with chronic piroplasmos¬ 
is presents a series of exacerbation, separated from each other by 
periods of rest more or less distinct. 
Of all these reeidive manifestations the first is generally the 
most serious. The others have reduced symptoms; finally they 
also disappear and the animal seems to return to its normal con¬ 
dition. The parasites are found in the blood of the two. or three 
first relapses, but always in reduced number.. 
The absence of reeidive is no proof of a perfect recovery of 
the animal. The blood of chronic-cases which had not had any 
reeidive for several successive months, has given positive results 
when injected in other animals. 
The difference which exists between these two last forms of 
piroplasmosis is principally in the greater number of access' and 
