Étude au microscope électronique de la pathogénèse intracellulaire rickettsienne chez Melolontha melolontha <span style="font-variant:small-caps">L.</span>

Summary: On ultra fine cross sections of adipeous tissues ofMelolontha melolontha taken at the successive stages of rickettsial infection the evolution of the pathogenesis in the cytoplasm was followed with electronic miscrocope. The appearance of the first lesions and the multiplication of the rickettsies in cytoplasmic groups were shown. A geometric ordening of the rickettsies was revealed in the heaps of rickettsies that were in the course of multiplying, leading to the formation of closely packed groups in the form of &#171;globular centers&#187;. The internal structure of these formations and of intracellular cystals is analyzed and research on their significance in compared pathology is being carried out.