SULPHUR. ()7 



made by burning them. It is obtained first in 

 the form of fumes, of a violet color, which con- 

 dense in small opaque crystals of a blackish grey 

 color and metallic lustre, resembling plumbago. It 

 appears to be an element that exists in small quan- 

 tity. It is capable of producing acids by combin- 

 ation with other substances. With oxygen, it 

 forms iodic acid ; and, with hydrogen, it forms hy- 

 driodic acid. It combines with phosphorus at the 

 common temperature, giving out heat and light, 

 and produces with it phosphuret of iodine. With 

 sulphur, it makes sulphur et of iodine. 



Iodine, also, unites with all the metals, forming 

 with them iodurets. 



SULPHUR. 



Sulphur, known also by the name of brimstone^ 

 is a mineral substance, frequently found pure in 

 nature. 



It is of a pale yellow colour, without taste and, 

 also without smell, except when heated. It is 

 chiefly a volcanic product, and a great deal of what 

 is used in this country is brought from Italy and 

 Sicily. It is found also in nature combined with 

 most of the metals as ores : united to iron, it forms 

 iron pyrites. 



Sulphur is extracted from pyrites by exposing it 

 to heat in tubes, by which the sulphur is driven out 

 and received in vessels with water : when melted 

 and poured into moulds, it constitutes the roll sul- 

 phur in common use. A good deal of this is made 

 in England. The sulphur thus obtained, however, 

 is not quite pure. To purify it, it is sublimed by 



F ^ 



