Excerpt from The American Journal of the Medical Sciences, Vol. 111
In 1836 Donne found a previously undescribed parasite in the vaginal secretions of women. These were described as roundish bodies about twice the size of pus corpuscles and difficult to distinguish from the latter except by their independent motion. The motion was produced by certain organs, viz., a flagelliform appendage at the anterior end which worked with great rapidity, and a row of short cilia, at one side and near the flagellum, which kept up a sort of rotary motion. At the posterior end was a tail-like appendage of variable shape (Fig. 18). On account of the fact that the parasite resembled monads in having a flagellum, and "trichodines" (ciliata) in having cilia, Donne gave it the name of trichomonas, with the specific name vaginale on account of the habitat. Although there were errors in Donne's description, it was remarkably good considering the methods of observation and the knowledge of micro-parasites then available. Certain details in the description will be mentioned later. Notwithstanding Donne's growing reputation as a microscopist, and the fact that his observations were controlled by such men as Dujardin, Milne-Edwards, Ricord, and others, many microscopists (Vogel, Siebold, Valentin) denied the parasitic nature of the bodies, and held them to be altered epithelial cells from the uterus. Later, however, Scanzoni and Kolliker, Hennig, Haussmann, and Gasser re-examined the organisms, mostly from the side of clinical microscopy.
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