different Earths for Carlon, 139 



confif^urations of a lake colour. The mass was uncommonly 

 dense', and the fracture possessed a lustre beyond that of a 

 highly finished razor-blade. 

 ~Exp. III. 400 grains of raw ironstone, 



7 . of charcoal, or l-57th. 



The fusion of this compound yielded an elegant spherule 

 of iron which weighed 15^ grains ; equal to S-rVV per cent. 

 The film of oxide upon the glass and the metallic lustre 

 of the fracture nearly gone. 



Exp. IV. 400 grains of raw ironstone, 



10 • of charcoal, or l-40th. 



This mixture formed a very perfect black glass, in the 

 bottom of which was found a globule of iron which weighed 

 35 grains ; equal to 8^ per cent. The fracture of the glass, 

 though small, presented a perfect crystallization, consisting 

 of diverging lines crossed by light feathery impressions re- 

 sembling hoar-frost, 



Exp. V. 400 grains of raw ironstone, 



20 of charcoal, or l-20th. 



There was obtained from- the fusion of this mixture an 

 oval mass of soft iron which weighed 59 grains : equal to 

 143 per cent. The film of oxide upon the surface of the 

 gla*3s was now nearly gone, and the c(jlour a deeper black 

 than in Exps. I, II, III, IV. 



Exp. VI. 400 grains of raw ironstone, 



33.), of carbon, or 1-1 2th. 



This mixture w^as exposed to 160" of Wcdgewood, and a 

 perfect fusion was the result. Five grains of the charcoal, 

 of a beautiful black colour, remained untaken up. A com- 

 pact metallic button was found in the glass, which weighed 

 75 grains ; and farther, twelve small globules weighed two 

 grains. Total 77 grains : equal to \Q\ per cent. 



The glass was dull whitish green, minutely parous, and 

 but slightly transparent. The film of oxide was entirely- 

 gone from the glass in this experiment. 

 Exp. VII. 400 grains of raw ironstone, 



44_4j carbon, or l-pth. 



This compound was fused at a high heat. The result 

 was perfect. A metallic button was obtained which weighed 

 82 grains, and small globules thrown against the sides and 

 cover of the crucible 24-. Total 84-i- grains : equal to 21^5- 

 per cent. 



Exp. VIII. 400 grains of raw ironstone, 



80 of carbon, or l-5th. 



This mixture was cxpofed till the crucible became soft, 



and 



