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LIMESTONE. 129 There are two passages in which crcla seems to be ap plicable to chalk : one in Horace, —— ‘ creta an carbone notandi lhe other in Pliny: ‘ Alia creta argentaria appellatur ni- torem argento reddens f tliis being a common use of chalk at the present day.”—Kid's Mineralogy, vol. i. P- 18, 19. 6. Limestone. Kalkstein, Werner. This species is divided into six subspecies, viz. Com- pact Limestone, Foliated Limestone, Fibrous Lime stone, Lamellar Limestone, Tufaceous Limestone or Calc-tufT, and Pisiform Limestone or Pea-stone'. . First Subspecies. Compact Limestone. Dichter Kalkstein, Werner. J-his subspecies is divided into three kinds, viz. Com mon Compact Limestone, Blue Vcsuvian Limestone, and Roestone. V °l. II. j First * Herat. Sat. iii. lib. i. t Pltn. N at , ni, t , cd> Brot vo ,_ ri _ p 18 4,
