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MOOR-COAL. 379 Geographic Situation. It occurs in the Leitmeritzer, Saatzer and Ellbogner circles in Bohemia; at Thalern, near Krems in Austria; also in Transylvania, Moravia, the island of Bornholm in the Baltic Sea, and the Faroe Islands. It occurs more frequently in Bohemia than in any other country. Observations. 1. When it is for some time exposed to the air, it hursts and falls into pieces. 2. It passes into the preceding subspecies. 4*. Black Coal. Schwartzkohle, Werner. This species contains six subspecies, viz. Pitch-Coal, Slate-Coal, Cannel-Coal, Foliated Coal, Coarse Coal, and Soot-Coal. First Subspecies. Pitch-Coal or Jet. Pechkohle, Werner. Gemma Samothracca, Plin. Hist. Nat. xxxvii. ?—Bitumen gagas, Waller, Syst. Min. t. ii. p. IOC.—Pechkohle, hslner, b. iii, s. 132.—La Houille piciforme, ou le Pechkohle, Broch. t. ii. p. 49.—Pechkohle, Reuss, b. iii. s. 142. Jd. Lud. b.i. s. 188. —Pechsteinkohle, Suck. tfi. s. 58.—Pechkohle, Bert. s. 349. Id. Molts, b. ii. s. S17- Id- Leonhard, Tabcl. s. 49. Id. Karslcn, Tabel. s. 58. Id. Lena, b. ii, s. lOGfi—Jet, Aik in, p. 4. External Characters. Its colour is velvet-black, and brownish-black when it is passing into bituminous-wood. It