DISSERTATION ON THE YAWS. 413 



Before we quit this subject, another curious circumstance 

 must be stated, viz. 



Persons in the "yaws arc liable to other eruptive diseases, 

 as measles and small-pox. The latter may be communicated 

 by inoculation. This is best done after the yaws are on the 

 decline, and it has a very happy effect, by superseding the 

 yaws, and carrying them completely off'. Or, should any of 

 the yaws return to the surface, they continue but for a short 

 time. 



