It is impossible to compute accurately the numbers of deaths from this disease--in the region of Victoria Nyanza alone the estimates extend to hundreds of thousands.
3.

In the third mode of insect conveyance the insect does not play a merely passive role, but becomes a part of the disease, itself undergoing infection, and a period in the life cycle of the organism takes place within it.

In all these cases quite a period of time must elapse before the insect is capable of transmitting the disease; in malaria, which is the best type of such a disease, this period is ten days.

Malaria is due to a small protozoan, the _Plasmodium malariae_, which was discovered by Lavaran, a French investigator, in 1882.

The organism lives within or on the surface of the red blood corpuscles.