[ 33 ] 



THE Syftem of Cronfledt is merely metallurgic, inveftigated upon 

 Chemical principles, peculiar and not compiled. 



Many genera are excluded, as Sand-flone, Schift, Soil, Tophj 

 Stalaclite, Eagle-ftone, Calculus^ Nitre. In the appendix 

 are 'added, Rock, Pumice-ftone, and Petrifadlions. 



He fuppofes Earths to be filiceous, granatine^ micaceous, mag- 

 nefiat^, zeolithic> chryfolampadine. 



He denies that Cryftals originate from falts; and confiders their 

 figures to be father curious than ufeful; and fuppofes that 

 earths may afTume a cryftalline figure without fait, for if the 

 cryrtallization of metals are produced by fufion> the caufe of 

 cfyflallization is not in falls. 



He doubts whether the colours of Gems have their origin from 

 metals.- 



He believes that Calx exifted before animals and vegetables. 



He denies. that the (Irata of the earth are uniform. 



Charaileriftic definitions he confiders ufelefs6 



VOL. VIT. ~ E 



