306 
P iroplasmosis 
and France where I. ricinus is prevalent. The transmission of the 
disease by means of larval stages of I. I'icinus, the progeny of ticks 
collected from diseased cattle suffering from piroplasmosis in German}', 
England and Ireland, has been demonstrated experimentally by Kossel 
and his colleagues, by Stockman, and by myself respectively. Although 
the symptoms due to P. divergens infection are similar to those produced 
by P. bovis, the disease appears to be milder. Animals which have 
“recovered” from P. divergens infection are susceptible to infection with 
Fig. 3. Piroplasvia bovis, showing the same mode of multiplication as P. cants ; (21) a 
parasite dividing directly into four. (Nuttall and Graham-Smith, 1907.) 
P. bovis. The parasites, moreover, show distinct morphological differ¬ 
ences which were recognized by Kossel and others, although it is but 
recently that MacFadyean and Stockman gave P. divergens its distinctive 
name. 
The well-known Texas fever of the United States, generally known 
as redwater or bovine haemoglobinuria in other parts of the world, is 
due to P. bovis (Fig. 3), and appears to be transmitted in nature almost 
solely by Boophihis annidatus and its varieties, B. australis and 
