282 
parasite in India and Japan. The symptoms differ 
in the following respects from those caused by 
P. bigeminum :— 
(i) Anaemia is only slight; (2) Haemoglobinuria 
is wanting ; (3) It is not transmissible by inoculation ; 
(4) Cattle immunized against P. bigeminum are suscep¬ 
tible to P. farvum ; (5) The mortality is very high 
ninety per cent, upwards. The incubation period is 
about a fortnight. The duration after the appearance 
of the first symptoms is about ten days. 
Fig. 92 . P. parvum. Bacilliform , cross forms , and intracellular 
protoplasmic masses 
Blood Examination. —(1) In the early stages of the 
disease bacilliform parasites and minute rings are found 
in great abundance ; (2) Later large forms and pears 
occur scantily ; (3) The arrangement of parasites in 
the form of a cross is characteristic ; (4) The occur¬ 
rence of protoplasmic masses (in size from one to three 
red cells) containing numerous small chromatin 
particles, in the endothelial cells of the spleen and 
lymphatic glands (and occasionally in the blood) is also 
characteristic (Fig. 92). 
Post-mortem. — (1) Great oedema of the lung 
occurs in about a third of the cases ; (2) The lymphatic 
