384 Miscellanies, -^ 



The above quantity of carbonate corresponds to 39.1 per cent, of 

 protoxide or 30.45 per cent, of pure metallic iron, which is 3.35 per 

 cent, below the above yield in pig w-etal, or it is 9.9 percent, of the 

 pig metal itself, to be regarded as pure iron matter ; which is proba- 

 bly very near the true average amount according to the latest and best 

 analyses. The yield in ironis equal to the average of Scotch ores in 

 the neighborhood of Glasgow. 



The second variety of the ore examined, was a sample from the 

 same locality, but from a different part of the bed from that in which 

 the preceding was found. Sp. grav. 2.896. Assayed in the dry way 

 it gave — 



Water, . 13.12 



Pig metal, 44.98 



Earthy matter, . . . . . 24.804 



Oxygen, . . . . . . . 17.11 



The ore seemed to have suffered a change by atmospheric influen- 

 ces, from the condition of a carbonate of the protoxide of iron, to 

 that of a hydrate of the peroxide ; in which process some of the 

 earthy ingredients may have washed away. Analyzed in the humid 

 way, it gave — 



Water, . . . . . . . 13.12 



Perbxide of iron, with a trace of raanganese, 63.65 



Silica, 13.45 



Alumina, 8.77 



Magnesia, ;...... 1.01 



100.00 

 The quantity of peroxide of iron corresponds to 44.55 per cent, of 

 iron, or .41 per cent, less than that of the metal actually obtained. 

 Hence it appears th;it the quantity of iron remaining in the cinder, is 

 very nearly equal to that of the carbon, &c,, in the pig metal. 



Near the second bed of coal opened on the slope of the hill north 

 of the northern branch of Beaver Creek, Prof, J. found some ore 

 thrown out in excavating a coal shaft. It is of a brown, or yellowish 

 brown color, compact, with small shining particles. Sp. grav. 3.555. 



At a temp, of 330^ it loses in moisture, . 0.550 



By strong calcination, it loses of water, . 10.048 



It contains of peroxide of iron, . . 71.120 



" earthy impurities, . . 13.382 



100. 

 The quantity of pig metal obtained in Prof. Johnson's analysis was 

 49.77 per cent. ; its color dark gray ; structure crystalline, granular. 



