Since the original report of Dobbin,1from this clinic in 1897, Clostridium welchii infections in the puerperium have been described by many observers. The literature up to 1928 has been adequately reviewed by Toombs and Michelson,2and since then significant communications have been added.3 Cl. welchii, known commonly also as Bacillus aerogenes capsulatus and the gas bacillus, is a rather short gram-positive rod, nonmotile and growing under fairly strict anaerobic conditions. It forms capsules in the animal body and under certain conditions readily sporulates. A so-called stormy fermentation of milk, with formation of clot, acid and gas, is characteristic. Classification into four types—A, B, C and D—is recognized, but only type A is met with in the human body. The organism is found in soil, water, milk, dust, sewage and the intestinal canal of man and animals. Its occurrence normally in the human vagina is debated, but