12 j 



case after case filled with specimens of polished 

 granite of every description, and of great variety of 

 appearance. That which is mainly felspar is bright 

 pink or dark red ; some pieces are light grey as 

 quartz predominates, and the darker kinds are full of 

 mica. 



I always glance at the heaps of stones by the 

 roadside, since a very slight knowledge of geology 

 tells me where they are likely to have come from, 

 and an otherwise uninteresting walk along a dusty 



CORNISH GRANITE 

 (showing orlhoclase crystals). 



road may be enlivened by a little thought about 

 the materials of which the road itself is made. 



Even the kerbstones of the London streets, 

 when washed clean by a heavy shower, reveal by 

 their varied tints of grey, red or pink, that they 

 have come from quarries in Scotland, Cornwall, 

 Devonshire, or the Isle of Man. 



In the beautiful Cornish valley of Lamorna, blocks 

 of granite measuring twenty-five feet in length by 

 eleven feet in diameter have sometimes been cut, 

 and the plinths for the railings of the British Museum 

 came from the Carnsew quarries in Cornwall. 



