Summary: Three spp. of clostridia were isolated from samples of raw cow and buffalo milk obtained near Cairo. Of 150 isolates of anaerobes, 108 were Clostridium perfringens, 30 were Cl. butyricum, and 12 were Cl. sporogenes. The Cl. perfringens isolates comprised 100 nonhaemolytic and 8 pathogenic haemolytic strains. The latter strains typed by neutralization tests, were of type A. Fifteen of the nonhaemolytic strains were also of type A; of these, 6 strains produced heat resistant spores and 9 strains produced heat susceptible spores. Feeding mice with these 15 nonhaemolytic strains caused marked reduction in intestinal passage time.