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GEOLOGICAL SOCIETY OF PENNSYLVANIA. 189 



sits, shales and conglomerates, in Mount Patrick, the 

 ridge immediately north of the second anticlinal parallel ; 

 and the same vein, apparently, has been found below 

 Millerstown on the Juniata. Being a small vein, it was 

 not thought expedient to proceed with the working at 

 either position. Vide pi. 7, No. 2 and 3. 



As the quality of this coal is somewhat peculiar, more 

 approaching to the Bedford county coal than to that of 

 Pottsville, its prevailing characters may be noticed. 



It breaks into thin flakes and irregular lamina, with a 

 shining glance cleavage ; colour dark leaden, moderately 

 brilliant ; contains some small quantity of sulphuret of 

 iron and much bitumen ; gives a bright white flame ; 

 softens and swells when heated, forming a hollow fire 

 having its smaller particles adhering or caking toge- 

 ther ; yields a thick smoke ; leaves a black coke and 

 a brownish ash. It is highly approved of by the black- 

 smiths for their purposes. On comparison with Karthaus 

 coal yields as much flame and a brighter light, being less 

 smoky and impure. When tried with the best Lyken's 

 valley coal, the following differences were observable. 

 When the blast is first applied, or when the fire is com- 

 menced, the Lyken's valley coal decrepitates, a circum- 

 stance not occurring with the Mount Patrick coal. The 

 former yields much less flame, and that little is chiefly 

 of a blue flickering unsteady quality, soon passing wholly 

 off*. It does not burn to a cinder, but leaves a white 

 slaty ash, and gives out very little smoke. 



I am happy to append the remarks subsequently fur- 

 nished by Mr Clemson, and as they were made under 

 different circumstances to my own, though arriving at 

 the same result, I have not suppressed any portion of 

 either. 



^' This coal has a homogeneous aspect ; is of a grey 

 black, and a shining metallic lustre. Its transverse 

 fracture is very unequal and difficult ; in another sense 

 it is conchoidal schistose. The fragments assume a splint- 



