vi PREFACE. Various new obfervations, and an account of fome newly difcovered mi neral products of thefe Iflands, and par ticularly of Ireland, I expect we fhall be informed of, by the ingenious and ex cellent chemift, Mr. Kir wan, in his new edition of Mineralogy. To him, to the late Cronftedt—Klaproth—Suckow —Monge—De la Metherie Born Gmelin—Werner—Blumenbach—Weft- rumb—Heyer—Chaptal—Furcroi —and feveral other eminent Authors, I ac knowledge my fincereft thanks, for the inftru&ion I have derived from their Publications. It will be obvious from the nature of my new Plan, that I fhall have occa- fion to tranfpofe fome fpecies in the fys- tem; as the tremolit—mica—and feveral others. I fhall