Structure and Development of Viruses of the Psittacosis-Lymphogranuloma Group Observed in the Electron Microscope

The morphology of viruses of the psittacosis-lymphogranuloma group, including their de-velopmental cycle, has been studied by many investigators. Bedson (1933), Bedson and Bland (1932, 1934), and Bland and Canti (1935) de-scribed, from their observations on different devel-opmental forms, that psittacosis virus undergoes a complex developmental cycle and that the virus may multiply by division at some stage of development. Other workers who investigated the developmental cycle of viruses of the psittacosis-lymphogranuloma group obtained results similar in the essential facts to those described by Bedson and his colleagues, and among these investigators