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358 BITUMINOUS FAMILY. 2. Mineral Oil, or Petroleum. Erdol, Werner. Bitumen liquidum, Plin. Hist. Nat. xxxv.-—Maltha tardc fluens, Wall t. ii. p 92.—Petrole, Home dc Lisle, t. ii. p. 591- Id. De Born, t. ii. p. 75 —Petrol, Kim. vol.ii. p. 43. Id. Eslner, b. iii. s 97- Id. Emm. b. ii. s- 43.—Bitumine liquide noi- ratre, Ilawj, t. iii. p. 312—L’Huile minerale commune, oil le Petrol, Brock, t. ii. p. 59, 60.—Gemeines Bergol, Reuss, b. iii. s. 96.-IOI. Id. Moks, b. ii. s. 302. Id. Leonhard, Tabel. s. 48.—Bitumen Petrole, Brong. t. ii. p. 24.—Vcr- dicktes Bergol, Karsten, Tabel. s. 58.—SteinoJ, Haas. s. 117- —Petroleum, Kid, vol.ii, p. 62.—Bergol, Lenz, b. ii. s. 1047- Petroleum, Aikin, p. 3. External Characters. Its colours are reddish and blackish brown, and brown, ish-black, sometimes inclining to green. It is fluid, but approaches more or less to the viscid state. It is shining and resinous. It feels greasy. It is semi-transparent, translucent, and opaque. It exhales a strong bituminous odour. It is so light as to swim on water. Chemical Characters. It inflames easily, emits a bluish flame, and yields a smoke more or less opaque, according to the density of the oil, and sometimes leaves a very small earthy resi due. Constituent