On the presence of spirochaetes in two cases of ulcerated parangi (yaws).

Castellani demonstrated in scrapings of yaws tissue a spirochaete, T. pertenue, later found to be the causal organism. He thus finally established it as a distinct organism from the syphilis spirochaete. Preliminary note in J. Ceylon. Br. Brit. med. Ass., 1905, 2, pt. 1, 54.