[Discovery of a protist parasite, apparently akin to Acrasiae, in the genital tract and various organs of primates].

Microcysts were first observed in histological sections of the placenta of a gibbon, the uterus of a Microcebus, showing a pyometra, the placenta, spleen and lung of a new born mangabey which died soon after birth from an interstitial pneumonia. Plasmodial forms were also discovered in the sections, either encysted or infiltrating the tissues. Cultures from all the above mentioned pathological material were attempted on a special medium, the composition of which will be given later. All cultures shew myxamoeba-like organisms aggregating and merging into pseudoplasmodial forms that produced microcysts. Attention is drawn to the pathogenic rôle of this new kind of parasites in order that they should be searched for, in every case of genital troubles not ascribable to other causes.