Abstract
Temperature is shown to act on spermatogenesis in Hirudo medicinalis in a manner which permits the production of animals at different stages of gametogenesis throughout the year. Staining properties of fuchsinophilic cells and neurons of type β 2 of the central nervous system has been followed in relation to gametogenic activity in the testis. The possible gonadotropic role of the fuchsinophilic cells, as well as the problem of the release of their secretions, are discussed.
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