Abstract
Female genital discs transplanted into [male] larvae give, in the course of their development, rise to oviducts which might become attached to the host testes. In these cases the attached testes suffer extensive degeneration. Only cellular contact of the oviducts to the testes brings about this phenomenon. Unattached [female] ducts do not affect the development of the testes. The degeneration causing principle is not sp. specific.

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