1 2 a Ohfervations upon Ihe art of 



gone, the mattei' mufl be put upon a filtering cloth, and warm 



TTater poured upon it, till it runs infipid. The magnelia i^ 

 then to be put upon chalk flones, which will abforb the 

 greatefl part of the moiflure, and it may at lafl be fully dried, 

 in a flove.'** 



t 



In preparing this medicine, no point in the procefs is more 

 important, than the repeated ablutions with foft pure water. 



The hardnefs of that from fome wells and fprings, renders it 

 altogether improper for the purpofe ; but foft river or rain 

 water, after being filtrated through a thick linen cloth, will 

 anfwer equally as well as diflilled water, recommended by 



fome operators. Tlie abkmons_iijpwevei\ fliould be repeated 



until the medicine be reduced to an impalpable powder, free 

 from all grittinefs or other impurities. The chalk flones em- 

 ployed for the purpofe of drying, fhould be frequently cleaned 

 and expofed to a moderate degree of heat, and the powder en- 



clofed in fheets of white paper, and carefully dried before the 

 fire or in a furnace. 



Thus have I endeavoured to contribute my mite to the com- 

 mon intereft ; and however deficient m.y claim to^ general ap- 



plaufe, I can repofe with confidence in the Iiope of candor {xoia 



L 



the patrons of the Arts and Sciences. 



Such is the intereiling nature of this fubje(f^, that the pro- 

 priety of a communication to the Academy of Arts and Sci- 



ences 



* 



5cQ Encyclopedb, Motherby's Medical Div^'onary, and Qulncy»s Dtfpenfatory, 



i5th edition, Appendix. 



