( 3^6 ) 



all the Negroes, once only in their lives, 

 are infefted with it, and fometimes the 

 Whites alfo, on whom its effedts are 

 much more violent. It is ufually be- 

 lieved that this diforder is communi- 

 cated by the flies, who have been feaft- 

 ing on a difeafed objeft, to thofe per- 

 fons who have fores, or fcratches, which 

 are uncovered ; and from many obfer- 

 vations, I think this is not improbable, 

 as none ever receive this diforder, whofe 

 fldns are whole ; for which reafon the 

 Whites are rarely infefted •> but the 

 backs of the Negroes being often raw by 

 whipping, and fufFered to remain naked, 

 they fcarce ever efcape it. It is ufual to 

 promote the eruption of the Yaws, as 

 foon as they appear, by giving fulphur 

 internally for fome days. After feveral 

 weeks, when the eruption is not only 

 complete, but the Yaws fuppurate, they 

 may be cured by a falivation with mer- 

 cury ; but the moft ufual method is, to 



com- 



