314 MINERALOGY. 



application of Arsenic, as by the application of Onion 

 or Garlic. 



13. Antimony. This Metal is of a dull whitish colour, of 

 a brittle and compact substance, and is about six times 

 heavier than water. 



Antimony is a Metal frequently used in various arts ; as 

 we before remarked, it forms one fifth of the composition of 

 Printing Types, it is used in Medicine, and for alloys with 

 other Metals ; it occurs combined with Arsenic, Silver, Iron, 

 Sulpher, &c. 



14. Bismuth. Pure Bismuth is of a white colour, tinged 

 with red ; its substance is brittle, and it is nearly eleven 

 times heavier than water. 



This is not abundant ; in its native state it is mostly alloy- 

 ed with Arsenic, it is also found combined in the Ores of 

 Silver, Iron, Cobalt, and Zinc ; the principal use made of 

 this Metal is for alloys, also as an ingredient in soft Solders ; 

 being one of the most fusible of Metals ; a preparation of 

 Bismuth is sometimes used by Painters in water colours ; on 

 paper it has a bluish tinge, but like Arsenic becomes black- 

 ish on exposure to the Air; and particularly if the air be 

 impregnated with any fceted or offensive effluvia. 



15. Cobalt. The weight of this Metal is about eight times 

 that of water ; its colour is grey with a tinge of red ; 

 and it is very difficult of fusion. 



