48 OEOLOGT. 



What is the principal ingredient in soapstone ? 



Is it easy or difficult to work? 



Does it endure or yield to heat? 



Which of the New England States furnishes it m 

 abundance? 



When greenstone contains imbedded crystals of fel- 

 spar and quartz, what is the rock called? 



Are the crystals dispersed through porphyry, felspar, 

 ox quartz, or both? 



For what purposes is porphyry used? 



Where is it found? 



What rock resembles porphyry? 



What is the shape of the imbedded minerals in amyg- 

 daloid? 



Where is amygdaloid found? 



How many letters in the geological alphabet, and 

 what their names? 



How many and what the names of these letters in the 

 geological alphabet, which form the greatest part of the 

 rocky and mountain masses upon the earth ? 



Of what rocks are the highest mountains upon the 

 earth composed ? 



Of what ingredients are soils composed? 



In regions where the rocks are argillite, does clay or 

 sand predominate in the soil? 



What are some of the reasons, why Geology should 

 become a branch of common school education ? 



