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and the equally delicate outer coat. Here the parasite, some thirty-six hours after the mosquito has fed, may be detected as a minute (6 $\mu$) oval or spherical body with a sharp outline and hyaline or slightly

Fig. 12.—Evolution of the crescent parasite in Anopheles maculipennis.
(Adapted from Grassi, Bignami, and Bastianelli.)

1 to 6, The parasite as found in the stomach wall; 7, isolated sporozoites; 8, sporozoites in the salivary gland; 9, section of stomach wall showing the parasite in situ.

granular contents in which the hæmozoin particles are plainly visible. It lies between the muscular fibres, which, as it grows, it dissociates to a certain extent.

During the next few days the parasite increases rapidly, acquiring a well-defined capsule, and, in