THE Powder, communicated to Doctor Campbel by his Genius, together, with the Use of the Loadstone, having wrought many wonderful Cures upon other Patients as well as himself; this Postscript is to acquaint the Publick, that any Person labouring under one or more of the following Calamities, viz. Hypochondriacal, Hysterical, Epileptical, Convulsive, or any other sort of Fits that either Sex can be subject to, may be reliev'd, after the same manner as aforemention'd; at Doctor Campbel's House, in Buckingham-Court, over against Old Man's Coffee-House at Chairing-Cross, where they may be readily furnish'd with his Pulvis Miraculosus, and the finest sort of Ægyptian Loadstones, ready arm'd and fitted for the purpose, which if apply'd and continu'd according to Direction never fail of Success.