Iioji u'ilh MangnnesiS. 355 



Weighing- 223 grains, or -441 per cent.; the eartliy matter of the 

 ore iiad resolved itself into a brownish opaque glass, partially 

 transparent in thin fragments. 



No. 2. Argillaceous iron ore . . . . . . 500 grs. 



Oxide of manganese . . . . . . 100 



Charcoal ..100 



Result of the fusion of this mixture, a rough' irregularly cry- 

 stallized button of metal, weighing 217 grains, which is a pro^ 

 duce of 43-pV per cent. Glass opaque blackish brown without 

 any transparency. 



No. 3. Argillaceous iron ore . . . . * , 500 grs. 



Oxide of manganese from which 22 per 

 cent, of oxvgcn and moisture had been 

 extracted .. .. .. .. 100 grs* 



Charcoal 100 



Result — A smooth regularly crystallized metallic button, 

 weighing 230 grains, cijual to 4G per cent. On a comparative 

 examination of the fractures of these experiments, the following 

 remarks v,-erc made. 



No. 1 button possessed a clear metallic fracture inclining tO 

 steel, filed and cut soft, and possessed considerable tenacity. 

 The grain was flat, confused like steel approaching tocast-ironi 

 No. 2 broke with a dark gray blue glance, more perfectly gra- 

 nular than the former, cut softer at first, but possessed less real 

 tiBuacity. No. 3 was extremely bntile, and disparted on the first 

 application of the chisel : — fracture different from the former, 

 silvery gray, crystalline distinct small grain, and resembled on 

 the whole some varieties of gray cast-iron. This difference of 

 appearance and increase of weight may jjrobably with justice 

 be attributed to a small portion of metallic manganese being 

 reduced from the roasted oxide. The glass of the first button 

 was cloudy opaque, though in thin fragments transparent. That 

 of the second button entirely opaque : i)ut the glass of the third 

 button with the de-oxidated manganese was amber green, 

 thoroughly transparent in thin pieces. 



The following experiments were performed with an enlarged 

 dose of charcoal, to compare results with the former. 



No. -4. Argillaceous iron ore . . . . . . 500 grs. 



Charcoal ^th . . .. .. ..125 



The fu-iion of this mixture yielded a perfect crystallized but- 

 ton of iron weighing 257 grains, equal to 51} per cent, (ilass 

 lead-milkv-blue, veined : eight grains of charcoal mixed with 

 some brilliant specks of carbiuet of iron were found unacted 

 upon. This fusion was so perfect, and the metallic reduction 

 so entire, that there did not seem to remain in the glass any 

 ajiprcciable (niantity of iron. The addition of 25 grains of char- 



Z 2 coal 



