292 Plasters ; .

thecary, who häs ferved an apprenticeüiip, know»that water is neceflary to' keep the heat moderateand prevent the fcorching and difcoloration of theoilj—that conftant ftirring is not lefsfo, to prevent thematter fwclling too haftily and running over thefides-of the vefiel,—and that, if a iubfequent addi-tion of water be neceflary, (as is generally the cafe,)itfhould be of a boiling heat, left fome of the boil-ing platter fhould fly in bis face. But it fhouldnot be forgotten that a -plafier is expected to ftick,in fome degree, to the pari on which it is applied,—-which this plafter but too cften will not de». Lew-is fays, fome of our induftrious medicine-makers(perhaps having heard rtfaidthatplafters are applica-tionsof littleuie) have thought a cheapercompofkiorevvould anfwer the purpofe, and have accordingly addeda iarge quantky of common whiting and hog's lard;wheR.ee it does not ftick fo well, and the krd is aptto become raneid and acrimonious. Whether thisplafter be fpolled by the fraud above mentioned,—>the ignorance,—or lazinefs,.—of the preparer, in notboiling it fufficiently, — many other plafters, ofwhich this forms the bafis, will be deficient in thequalities expected by the College,

EMPLAS-