1 94 SULPHUR NAPHTHA. 



immense beds of peat and other vegetable sub- 

 stances, which are slowly undergoing a change 

 into this mineral. 



Sulphur is another combustible body, which is 

 exceedingly useful in various arts. Great quanti- 

 ties are found about volcanoes, as Mount ^Etna, 

 Mount Vesuvius, in Iceland, and Mexico. It is 

 an important article of commerce in these countries. 

 Gunpowder is made in part from sulphur. One 

 of its principal uses, however, is for making sul- 

 phuric acid, which is essential in bleaching, hat- 

 making, tanning, and dyeing. 



Naphtha and petroleum are two combustible 

 bodies, also belonging to the mineral kingdom. 

 They are found in various parts of the world, 

 either floating on the surface of water, or forming 

 actual springs. They are very inflammable, and 

 burn like oil in lamps. 



Questions. 



To the possession of what mineral does Great Britain owe 

 much of her wealth ? 



What is the reason that the mineral kingdom is so valuable 

 in England ? 



Are coal and wood much alike in their nature ? 



What are coal-fields ? 



W T hat do we find when we examine pieces of coal ? 



How many years is it supposed the coal of England will 

 last? 



In what situations is sulphur plentifully found 1 



What acid is made from it, and for what purposes is it 

 used? 



Are there any other combustible bodies in the mineral 

 kingdom ? 



