L 29 
THE opinions of VVolterfdorf are principally thefe: 
That Soil proceeding from vegetable or animal fubftanccs pafles 
gradually into clay, n. 6. : but this appears to want demon- 
ftration. 
That all Rock, when ftruck agaipfl: fteel, gives puf fparks. 
That Pumice-ftone is npt the produdlof volcanos, n. 14. 
That the Lapis atramentarius is produced by eroded vitriol, 
n. 24. 
That Cobalt is of the fame genus vyith arfenic, n. 30. 
That true native Iron no where exifts, n. 34. 
I^inne was doubtlefs thp firft who, according to the laws of Syf- 
tem> endeavoured to reduce the fcience of Mineralogy into 
Clafies and Orders. Pref. 
^e divides Spar into three diftinfl genera, or more properly intoi 
|hree orders ; Vitrefeent, Gypfeous, and Alcaline. 
