1 70 Fossils. 



40 Farenheit, and shews then some tena- 

 city and ductility. 



Lead is a base metal of a bluish white 

 colour. Its specific gravity is from 11,- 

 352 to 11,445 ; it is considerably ductile 

 but little tenacious and hard, hence it may 

 be extended in thin plates by the hammer 

 but not drawn into fine wire. It has 

 scarcely any elasticity. 



Bismuth is a yellowish or reddish white 

 metal, of a foliated fracture, and very 

 brittle, it being even reducible to powder 

 by the hammer. Its specific gravity is 

 from 9,670 to 9,822. It is somewhat 

 harder than lead but more fusible. 



Nickel is a greyish white metal, of a 

 specific gravity between 9,OOO and 9,333 

 It is malleable, and very compact or firm. 



Copper is a base metal, of a brownish 

 red colour ; sonorous, very tenacious, 

 ductile, and malleable ; of a considerable 

 compactness ; of a moderate hardness 

 and elasticity ; and of an hackly fracture. 

 Its specific gravity varies from 7,788 to 

 9,000. 



Arsenic is a brittle metal, and on the 

 recent fracture, of a mean colour, betwixt 

 tin- white and lead-grey ; but, on expo- 



