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as a result of inflammation, surgery or trauma in man (Friedman & Garske, 1949; King, 1955; Zettergren, 1958; Phadke, 1964) and may incite the formation of a granuloma in which the presence of large mononuclear cells is a typical feature. The extravasated spermatozoa become engulfed almost exclusively by macrophages. Decapitated spermatozoa (Roussel, Stallcup & Austin, 1967) and even living, morphologically normal spermatozoa (Phadke, 1964) may undergo phagocytosis by macrophages under physiological condi¬ tions within the epididymal tubules. Local infection or obstruction of the epididymis or vas deferens leads to a marked increase in the number of macro¬ phages engulfing spermatozoa within the epididymal ducts. Roussel et al. (1967) suggested that decapitated spermatozoa released a chemotactic attractant for macrophages. This phagocytosis of spermatozoa by macrophages in the male genital tract is in marked contrast to phagocytosis of spermatozoa (in seminal fluid) by neutrophils within the female genital tract. We have currently described (Maroni, Symon & Wilkinson, 1971) the chemotactic attraction of human neutrophils towards spermatozoa and seminal fluid in the presence of

SELECTIVE CHEMOTAXIS OF MACROPHAGES TOWARDS HUMAN AND GUINEA-PIG SPERMATOZOA