English: Piroplasma canis in the blood of dogs. Plate IX from:
(1905). "Canine Piroplasmosis. II". The Journal of Hygiene 5 (3): 237-249.. Figure numbers have been added for clarity.
Piroplasma canis in the blood of dogs experimentally infected in Cambridge with the
South African disease. The dogs were infected by ticks and by blood inoculations.
Stained by Leishman's method. Drawn with Zeiss Apochr. 1/12 oil immersion objective and
eyepiece 12, larger than they were seen because of the impossibility of reproducing the
details in smaller figures. The figures in the Plate consequently all appear magnified about
3400. Drawn by G. H. F. N.
Figs. 1 — 8. Young intracorpuscular forms, rings, and dividing ovoid bodies ending in a
group of four. Blood obtained chiefly from the peripheral circulation, also from
spleen and lung smears.
Figs. 9 — 32. Series of intracorpuscular parasites beginning with a large single oval
parasite. Longitudinal fission leading to groups of typical pyriform bodies etc., in
groups of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 21. The nuclear division
is seen to precede the separation of the daughter cells. Figs. 9 and 10 from liver
and spleen smears; 12 — 15, from peripheral blood, the rest chiefly from spleen, bone-
marrow, lung, and liver smears.
Figs. 33 — 42. Amoeboid forms in spleen and marrow smears.
Fig. 43. Large amoeboid form in peripheral blood.
Fig. 44. Large spherical form with exceptionally large chromatin masses. Developing
sexual form? (brain).
Fig. 45. Nucleated red corpuscle containing two parasites.
Fig. 4G. Group of 10 free parasites liberated from a corpuscle of which all trace has dis-
appeared (lung).
Figs. 47 — 58. Parasites in various stages of development and lying free in the plasma
(lung and spleen).
Figs. 59—62. Sausage-shaped gametes (?) lying free in the plasma in peripheral blood.
Figs. 63 — 67. Infected corpuscles taken up by leucocytes and undergoing progressive
degeneration in order of the figures from left to right. lu Fig. 67 only the chromatin
masses of the parasites are left.