many other parts of the tropics. I believe I have seen the same condition in South China.

It occurs at any age from childhood to 80. Leys saw it in Guam in children of 3, 4 and 9 years respectively.

[Photo: P. H. Bahr.

Fig. 92.—Tertiary yaws, showing tibial periosteal nodes, ulcers, and deformity of phalanges.

The lesion has been attributed to leprosy, tuberculosis, syphilis, and yaws. Against its being a leprous disease is the circumstance that it is not attended with any of the other phenomena of leprosy.