This cycle of development may continue for an indefinite time, and there may be such a rapid increase in the parasites as to bring about the death of the individual; but with him the parasite would also perish, for there would be no way of extending the infection and providing a new crop.
The disease has been transmitted by injecting the infected blood into a normal individual.
[Illustration: FIG.

20 .-- PART OF THE CYCLE OF DEVELOPMENT OF THE ORGANISM OF MALARIA, _a-g_, Cycle of forty-eight hour development, the period of chill coinciding with the appearance of _f_ and _g_ in the blood.

The organisms _g_, which result from segmentation, attack other corpuscles and a new cycle begins.

_h_, The male form or microgametocyte, with the protruding and actively moving spermatozoa, one of which is shown free.

_i_ and _j_ are the macrogametes or female forms.