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SLATE-ClAY. 383 Specific gravity,— According to Kirwan, 1.250 to 1.370 English. 1 259 From Irvine in Scotland. Wiedeman, 1.277 Richter, 1.26125 to 1.3730 From Sabrze in Silesia. 1.32132 to 1.3820 Bielschowitz, Chemical Characters. It burns longer than cannel or columnar coal; cakes inore or less, and after combustion leaves a slag. Constituent Parts. Slate-Coal of Wal- Slate-Coal of Slate-Coal of Biel denbtirg. Sarbze. schowitz. Bitumen, 3G.875 Bitumen, 32.93-1 Bitumen, 37.8901 Carbon, 37.993 Carbon, 63-312 Carbon, 58.172 Earth, 5.823 Earth, and Earths, and Iron, and Oxide of Oxide of Oxide of Iron, 3.90-1 Iron, 3.937 Manga nese, 1.157 Hi chirr, Neue Gc- llkhter, Neue Gc' genst. d. Chem. genst. d. Chem. •Itickler, Neue Gc- vi. 221. vi. 221. Renst. d. Chem, vi. 231. Slate-Coal o£- Whitehaven. Carbon, 5G.& Mixture of As phalt and Maltha, in which the asphulc pre dominates, 13 KirKd}i. Geognostic and Geographic Situations. In England it is found in vast quantity, at Newcastle, fi nd in the great expanse of the coal formation in that “eighbourhood ; in the whole tract of the coal formation 'vhich stretches from Bolton, by Allonhy, Workington to Whitehaven ; in Scotland, in almost every quarter of the great river-district of the Forth ; in great quantity irr the river-district of the Clyde, ut Cannoby, Sanquhar, a nd Kirkconnel, in Dumfriesshireit is found also ii; Thuringia;
