Utt Experiments on various Earths. 



under various temperatures, but without being more suc- 

 cessful in producing the melal in a state of greater purity. 



XVI. — 100 giains of pure baryes, 200 of iron-stone, and 

 10 of charcoal, fused together, gave the following result : 

 Surface a black shining class of considerable thickness, co- 

 veririg a perfect crystallize J regtdus of the same matter as 

 was found in Experiment XV. The same want of metallic 

 property was evident in this as in the last, though the spe- 

 cific gravity of the mass was very much increased. On one 

 side (and not under the imperfect regulus of barytium) was 

 found a metallic spherule, supposed to be revived by the 

 addition of the two grains of charcoal — it weighed 1 \ grain. 



XVII.~ 100 grains of pure barytes, 200 of iron-stone, 

 and 13 \ of charcoal, gave a result similar to the former in 

 point of glass. A smaller and more perfect^ regulus- was 

 found under it, alongside of which, as in the former, was 

 found a metallic spherule of iron weighing 10 grains. 



XVIII. — 1(0 grains of pure barytes, with 200 of iron- 

 stone, and 20 of charcoal. The result of the fusion of tint 

 compound presented something different from any of the 

 former. A button of iron was found weighing 33 grains ; 

 this was surmounted by a black glass, which now con- 

 tained no barytium. Over this glass, and immediately on 

 the surface, a metallic crust presented itself. Tt was cry- 

 stallized in small concentric radii inclining to a brownish 

 silvery colour, and brightened a little under the file. It had, 

 in every respect, a more metalline appearance, and, so far 

 as polish, continuity of grain and lustre were concerned, 

 was much superior to any of the former results. 



The same experiment was repealed again and again 

 sometimes with increased doses of iron-stone and charcoal 

 but none of the results were more perfect than the present 

 Despairing, therefore, of any thing more perfect with iron 

 oxide and charcoal, it was resolved to try the effect of mal 

 feable iron tilings in place of iron oxide. Having used all 

 the pure barytes in my possession, the following experi- 

 ments were made with a fine crystallized specimen of car- 

 bonate of barytes. 



XIX. 115 



