342 On the ylffinitics of 



The fusion of this mixture afforded a fine metallic button 

 of malleable iron which weighed 30 grains ; equal to per 

 cent, from the artificial compound. The same experiment 

 repeated yielded a button of iron which weighed 28 grains j 

 equal to 5-^ths per cent. 



The extra quantity of iron revived in this experiment in 

 consequence of vitrified Cornwall clay, beyond what took 

 place in "Experiments I, IX, and X, with the same pro- 

 portions of mixture, cannot be satisfactorily accounted 

 for. It is an important lesson, however, in so far as it 

 manifests the peculiar action which even the same earth, 

 differently prepared, has upon the separation of iron from 

 its ore. 



'Recapitulation of the foregoing Experiments ivith Oxide 

 and Clay in the Proportion of six of the latter to four of 

 the former, 



Exp. I. l-40th of carbon yielded 2-^ths per cent. . 



II. l-25th of ditto ' 9foths 



III. l-15th of ditto 12/^ths 



IV. 1 -1 2th of ditto 15-^ths 



V. Mixture not fusible. 



YI. Ditto ditto. 

 VIII. No. IV, fused by means of 80 grains, chalk s 

 iron separated equal to 22 l R ^ths per cent. 



Second Class 



Consisted of 6 parts of very pure sand, 



4 parts of the same oxide formerly used. 

 I. 500 grains of this mixture were exposed to fusion. The 

 mass of glass was carefully examined afterwards to ascer- 

 tain whether it contained any revived metal. The glass 

 was dense 'and uniform in the fracture throughout, without 

 anv trace or vestige of metallic iron. 

 IL, 500 grains of mixture, 



12^ of charcoal, or nearly l-40th. 



. This mixture was reduced to fusion, and a perfect glasa- 

 obtaineu faintly marked with dull yellow, but possessing 

 metallic lustre. A minute irregular mass of malleable iron, 

 was found separated which weighed 7 grains : equal to 1-^ths 

 per cent. 



III. Mixture - - - 500 grains. 



Charcoal 1 -.25th,. or - - 20 



The fusion erf this was productive. of five very perfect 

 spherules of malleable iron which weighed 37 grains. Pro- 

 duce 



