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A brilliant investigation into the biology of certain hematozoa infecting several species of our American birds, especially the common crow, carried on in the clinical laboratory of the Johns Hopkins Hospital, by MacCallum and Opie, and recorded in detail in the current number of the Journal of Experimental Medicine (Volume 3, No. 1, 1898), has lead MacCallum to make certain observations upon the sexuality and the sexual processes of these parasites which promise to be of far-reaching importance in solving the problems surrounding these biologic phenomena in various hematozoan species, including the organisms of human malaria. The three papers in which these writers describe their studies in avian malaria are valuable contributions to the comparative pathology of hematozoan infections and are well worth careful consideration. The balance of the work is, however, eclipsed in MacCallum's second paper ("On the Hematozoan Infections of Birds," loc.cit., pp. 117-136) which contains the account
SEXUAL DIFFERENTIATION AND THE PROCESS OF FERTILIZATION IN THE HEMATOZOA.. JAMA. 1898;XXX(13):738-739. doi:10.1001/jama.1898.02440650046005