phonation may be retained, articulation is seriously impaired.

[Photo: P. H. Bahr.

Fig. 91.—Tertiary yaws, showing sabre-like deformity of tibia, radius and ulna, and multiple cutaneous ulcerations.

This disease is very common in parts of the West Indies—Dominica for example (60 cases in a population of 2,000, Numa Rat), Guam, where it is known as gangosa (1·5 per cent. of the population, Leys), the Carolines, Fiji, British Guiana, and, undoubtedly