COMPARATIVE VALUE OP VARIOUS KINDS OP STONE. 47 



The plate shows the fractured appearance of, 



Sandstone, Shipley, Bradford. 



., Heaton, Bradford. 



„ Heaton Park, Bradford. 



„ Idle Quarry. 



„ Spinkwell. 



Grauwacke, Penmaenmawr, Wales. 

 Granite, Mount Sorrel. 



A. 

 Limestone, B. 



c. 



„ Anston. 



Sandstone, D. 

 E. 



The other specimens operated upon were not sufficiently 

 defined in the line of fracture to admit of their form being 

 sketched; most of them having been crushed almost to 

 powder. 



