( xvi ) tion from Mr. Werner’s tracl on that fub- je£t; fome new Genera, and many new Species, are intrcduced, the analyfis by -different perfons annexed. Not flavifhly addi&ed to any lyftem, I have taken the liberty, when I thought it neceffary, of framing new diftinftions, and even of in- troducing a new clafs; I have alfo added the deficription of fome Irhh foffils, which appeared not to have been known in other countries. Volcanic produftions, that in the former edition were but flightly men- tioned, will here be found minutely confi- dered, and the origin of bafalt fully dif- cuffed. I have alfo treated of the analyfis of Earths and Stones much more at large than before, and impartially examined thofe already made; in a word, I hope 1 have faithfully reprefented in this volume the prefent ffate of the fcience, as far as Earths and Stones are concerned. The fecond part, which treats of faline, inflammable, and raetallic fubftances, is in fome forwardnefs, and will, I etfpedt, be ready for publication in a twelvemonth. Dublin, Jan. i, 1795. CON,