164 Preparations of

matter is dried. Mix the matter, when cold,with the fea-falr, in a glafs veffel j then fub-lime in a glafs cucurbit, with an heat gradual-ly raifed. Laftly, let the fublimed matter befeparated from the fcorias.

R

M

This is the Mercur'ms corrqfivus Juhtimatus ofthe former Difpenfatory, which, at the time thatwas publilhed, was prepared by few Apothecaiiesor Chemifls, and generally imported from Holland.It has been, for fome years, prepared by feveral cbe-mifts in London, and large quantities exported to fo-

reign countnes.

The Dutch fublimate was long fufpe&ed to beadulterated with arfenic, and is afferted to be fo, byPiderit, folatelyas 1782. (Pharmac. ration.) Iffucha fophiflication was, by fome peculiar management,prafticable, which Lewis feems to have been afraidto deny,—it might be detecled by the fmell of gar-lic upon throwing it on burning coals. Experiments,hqwever, have lately proved not only that arfenicwill not fublime with an heat which elevates muria-ted Quickfilver ; but a flronger argument againftTuch fophiflication is,—that arfenic is not necef-

fary