[A] treatise on the small-pox and fevers : Wherein is demonstrated the salutary effects of a medicine, known by the name of sexton's powder; for a more certain and easy cure of those distempers, than has hitherto been known or practised. Humbly addressed to the publick, but in particular to the president, vice-presidents, and the rest of the governors of the small-pox hospital. By J. Wheler, surgeon.