THE TEANSMISSION OF LEISHMANIOSIS BY CULTURES. 383 
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xxiii, pp. 361, 441. 
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DESCRIPTION OF PLATE 21 
(From smears of peritoneal fluid), 
Illustrating Dr. Arrigo Visentini’s paper on “ The Trans- 
mission of Leishmaniosis by means of Cultures, and the 
Mechanism of the Natural Immunity in Rats and 
Guinea-pigs.” 
[The figures are drawn with the camera lucida at a magnification of 
2000 diameters.] 
Fig. 1. — Five minutes after the injection of a culture of Leish- 
mania, showing one parasite absorbed, and another in process of 
absorption, by a mononuclear leucocyte. 
Fig. 2. — Ten minutes after injection; a leptomonad fonn absorbed, 
another held fast by its flagellum. 
Fig. 3. — Thirty minutes after injection ; a mononuclear containing 
thiee parasites, in process of destruction, and in the act of absorbing 
a fourth. 
