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Grassi exposed in his laboratory a plate containing a great number of the eggs of a human parasite, the Tricocephalus dispar. Some sheets of white paper were placed in the kitchen, which stands about ten meters from the laboratory. After some hours, the usual little spots produced by the fæces of flies were found on the paper.
These spots, when examined by the microscope, were found to contain some of the eggs of the tricocephalus. Some of the flies themselves were then caught, and their intestines presented large numbers of the ova. Similar experiments with the ova of the Oxyuris vermicularis and of the Toenia solium afforded corresponding results.
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