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The optimum method of transmission for a blood parasite is brought about when it is withdrawn from the blood by an insect and is reintroduced by it into suitable blood. Leaving aside the cases where the insect plays but a mechanical rôle in much the same manner as a syringe needle, cases of...
The classification of trypanosomes is discussed, and it is pointed out that attempts to subdivide the genus Trypanosama have not been satisfactory. Wen-yon's division into groups based on the mode of transmission and method of evolution in the invertebrate, may be satisfactory from the medical and...