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PREFACE. vii tention to the external characters, extremely imper- pedt, yet, as it was not fo much Cronfted’s intention to write an orydtognoftic fyftem as one of chemical mineralogy, this defedt mull not befuppofed to detract from the merit of his work. To Cronftedt fucceeded Lehman and Vogel, but their orydtognoftic labours were of little importance. In 1768, Linnaeus publilhed a fecond edition of his Syftema Mineralogicum. In it the claftes are the ame with thofe of the firft edition, but the number of orders and genera is increafed. He prefixed to it an account of the external characters which he employed in the defcription of minerals. Refpedting ■his fyftem of characters, Werner obferves, “ Nur ift ft 7 ord ^ un £> wen man es anders noch eine nennen cc j 31105 * n ^ Cr er au ffhhrt, nicht zu loben : zu- e m fmd folche nicht vollftar.dig abgehandelt, in- «tT 7, gar viele fehlen: auch find die mehr ef- « j 6r arun £ en zu kurz, und defwegen dunkel ^ und unverftandlichj und endlich fo fehlen erlau- “ ft 77 dUr0h ^fpiele, welche doch zum ver- ‘ „ 1C T eK der hefchreibungen fehr vieles beitra- gen. —Werner t f. 48. charitt ^ 7 publifhed tables of the external publillJd^fvftr 6 " 3 ^’ and Sir JolmHill, in .77;, tables of ft, m °f mmer aIogy, accompanied with ofPeithner ] CXternal chara fters, refembling thofe ^ithne,, but more extenfive and determinate*. fchaftcn. Z\veitp7!i !me .7’ e ^ C 2 rum,e dtr Bergwcrks wiffen. Sfo. • handling uber die mineralegic. Prag. 1770. Wallerius