Abstract
I believe there is no group of Protozoa which has yielded more interesting results from its investigation than that of the Flagellata. Even since the wonderful work of Dallinger and Drysdale was published, the flagellates have been invested with a fascinating uncertainty regarding their reproductive capacities. And, although this work has never been confirmed, the recent discoveries of Schaudinn and Prowazek have revealed the existence of life-histories which are in no way less remarkable than those described by the English investigators. Yet in spite of all this the flagellates —with the exception of the trypanosomes—are much neglected by protozoologists.

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