different Earths for Carbon. 33 



. 1. Mixture - - - 300 grs. 



Charcoal l-40th, or - - 1-J^ 



A black roush earthy glass was obtained by iht fusiou 

 of thi* m4Xtt.ire, not unlike a furnace cinder. It was care- 

 fully examined, but without finding any trace of revived 

 metal. 



II. Mixture - - - 500 grs. 



Charcoal l-30th, or - - lG-{'^ 



The class obtained at this time was more perfect, glassy, 

 and shining upon the surface. The interior very like tinery 

 cinder. There appeared no vestige of revived iron. 



in. The same as before, performed with l-20th, or 25 

 o-rains of charcoal. The glass had assumed a considerable 

 portion of lustre and a few pearly shades upon the surface, 

 but still there appeared no metallic produce. 



IV. Mixture - - - 500 grs. 

 Charcoal I- 15th, or - - 33 



A very perfect mass of glass was obtained by the fusion 

 of this mixture. The surface was black, smooth, and 

 shining ; the fracture dense and opake. A neat metallic 

 sphe^^le was found which weighed 1 7 grains ; equal to 3^ 

 per cent. The corrrcsponding experiment as to carbon with 

 clav yielded 63 grains, and with silex 63 and 63 of iron. 



V. Mixture - - - 500 grs. 

 Charcoal 1-lOth, or - - 50 



A perfect fusion and fine black glass were obtained, ac- 

 companied by a flattish metallic button of iron which 

 weiohed 38 grains j equal to II J'^ per cent. 



VI. Mixture : - - - 500 grs. 

 Charcoal l-7lh, or nearly - . ^"^ . 



A dark rich green glass was obtained in this fusion, and 

 a bright silvery-coloured metallic button which weighed 

 124 grains; equal to 24-^^ per cent. 



VII. Mixture - - - 500 grs. 

 Charcoal 1 -3th, or - - 100 



This mixture fused, and yielded a fine crystallized button 

 . of steel. It was found to weigh - - 120 grs. 



Globules thrown up against the top and sides 



of the crucible duriny; ebullition - - 10 



Total 130 



Equal to 26 per cent. _ 



The colour of the glass was light blueish green, very 

 transparent in thin fragments. 



■ iVllI. Mixture - - - 500 grs. 



Charcoal l-4th, or - - 125 



Vol. 20. No, 77. Oct, 1804. C The 



