I 33 .1 
THE Syftem of Crohftedt is merely inetallurgic, inveftigated upbil 
Chemical principles, peculiar and not compiled. 
Many genera arc excluded, as Sand. (lone, Schift, Soil, Toph, 
StalaSite, Eagle-ftdne, Calculus, Nitre. In the appendix 
are added, Rocki Pumice-ftorie, and Petrifadions. 
He fuppofes Earths to be filiceous, granatine, micaceous, mag- 
nefiate, zeolithici chryfolampadine. 
He denies that Cryftals originate from falts, and confiders their 
figures to be rather curious than ufeful; and fuppofes that 
earths may aifume a cryftalline figure without fait, for if the 
cryfiallization of metals are produced by fufion, the caufe of 
cryftallization is not in falts. 
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 ftrata of the earth are uniform. 
Charaderiftic definitions he confiders ufelefs. 
VOL. vir, — E 
