234 On the Affinities of 



any matter v. halever being found within the crnril)le vvliert 

 cold. A pure flintv glass was oljtaincd, and covered th'.* 

 ntetallic result, which was found of the quality of cast steel. 

 Its weight, including two small globules, was 42 grains ; 

 equal to 21 per cent.; and 4 per cent, more than was ob- 

 taiped in Experiment No. V, with 1-loih of carbon. 



Exp. II. 200 grains of raw ironstone, 



28 of carbon, or nearly l-7lh, 



50 of Sturbridge clay. 



The result of this fusion was an irregular shaped button 

 of iron weighing 33 grains, or 17^ per cent. No part of 

 the mixture remained unfused. The glass was of a black 

 colour and very dense, w'ith every appearance of containing- 

 a portion of iron. 



It would appear to result from this and the former expe- 

 riment, that a mixture of l-4th of sand is of more service 

 in reviving the metal of calcareous ironstones than an equal 

 weight of clay. 



The second variety of calcareous ironstone operated upon 

 is found in the shape of oval balls weighing about 7 pounds 

 each. The external colour is rustv yellow. The fracture 

 is splinty, of a grayish white colour and porcelain appear- 

 ance. 



Exp. I. 400 grains of raw ironstone yielded a verv pon- 

 derous glass, dense, and free from honeycombs throuoh- 

 out, and without any symptoms of revived metal. 



FjXp. II. 400 grains of raw ironstone, 



13-V —of carbon, or l-30lh. 



The fusion of this mixture formed a glass nearly the same 

 35 in No. I. In the middle of this glass I found a perfect 

 globule of iron which weighed 4 grains; equal to 1 per 

 cent. The .surface of the glass was deeply enamelled with 

 oxide, and the ft-acture of a dazzling metallic lustre. 



Exp. II [. 400 grains of raw ironstone, 



20 of carbon, or l-20th. 



From the fusion of this I obtained a very fine spherule of 

 iron which weighed 23 grains, and equal to Gl per cent. 



Exp. IV. 400 grains of raw ironstone, 



40 of carbon, or 1-lOth. 



This mixture when fused yielded a beautiful smooth 

 button of metal weighing 68 grains ; equal in point of 

 product to 17 per cent. • Tlie glass was still black and 

 shining : the fr.icture in point of lustre resembled the polish 

 of a highly finished razor-blade. 



Exp. V, 400 grains of raw ironstone, 



37 of carbon, or l-7ih. 



A metallic 



