( 473 ) . v $ SECOND SPECIES, Chalk. Kreide.—Werntr. Creta alba, Wall. t. i. p. 27—Kreide, Wid. f. 492.— Chalk, Kiriv. vol. 1. p. 77 Kreide, EJlntr, b. a. f. 917. Id. Emm. b. 1. f. 433—Creta commune, Nap. p. 331.—La craie, Brocb. t. 1. p. 521, External Characters. * Its colour is yellowifh white, which fometimes alfo approaches to l’now white and greyilh white. It is fometimes marked with yellowifh brown fpots. Occurs maflive, diileminated, and as cruft cover ing flint. Internally it is dull. Fracture pretty fine earthy. Fragments indeterminately angular, blunt edged. Opaque. Soils. Writes. Very foft, and often paffes into friable. Feels