( viii )

and, from its collefred light, render ourwork more clear and luminous. It wasour prineipal wim that every chemical mat-ter, applicable to the practice of Phyfic,fhould be introduced by us,not onlyfreed fromerror, but more perfecl: and neat, as well asmorefcientifkallydigefled andarranged, thanhad been ufual among us. All our care wasnot, however, fo far wafted on this very dif-ficult part of our work as to neglec~l otherthings, oronly touch onthem curlbrily andby chance ; as the compofition of each me-diane was feparately and carefully weighed jin order that if any thing was found defi-cient it might beadded, —iftoo much, orredundant, taken away. Nor have wemade any fcruple, in executing this duty,to cutoffwhole formulas when of little ufe,and to infert others more ufeful, — in facha manner, however, that no new remedyhas been fondly adopted, no one, in conftantufe and praclice, rejected.

Greatcarehas been taken that very fewtra-ces ftiould remain of anile fuperllition ;

and,