120 iRambles witb Mature Students 



cornelian. When polished they form ornamental 

 paper-weights, Red jasper, fit to be cut into seals, 

 is also abundant here. 



Blocks of pudding-stone are occasionally exposed 

 in our fields as the plough turns up the soil. This 

 stone was once grey mud, into which pebbles large 

 and small became embedded ; then, in process of 

 time, the mass hardened into solid rock, which, when 



POLISHED QUARTZITE PEBBLE. 



sawn into pieces, will take a fine polish, the stones in 

 it looking much like plums in a pudding, hence its 

 common name. 



Some of my readers may live in mountainous 

 places where granite rocks exist ; these will afford 

 an interesting subject for study. Granite consists 

 mainly of three substances, the white or yellowish 

 grains being quartz, the pink felspar, and the black 

 mica. 



In the Museum of Geology 1 in London we can sec 



1 This museum in Jermyn Street is always open and quite free of 



