No. 112.] 



783 



Peroxide of iron, . ....... 



Protoxide of iron, 



Silica, 



Alumina, 



Carbonate of lime, 



Percentage of pure iron in 

 the per and protoxides,. 



Percentage of oxygen in 

 the per and protoxides, 



No. 124. 



Hematite, 

 Moxiah. 



76.06 



No. 125. No. 126. 



Butler's Same after ex- 

 Magnetic ore. posure lo at- 



22.82 

 1.08 



99 . 96 



52.741 



23.319 



99.85 



61.202 



23.818 



99.91 



50.289 



19.841 



Prof. Salisbury makes the following practical and judicious 

 suggestions: " Nos. 125 and 126 should be well roasted before 

 placing them in the furnace for reduction. The roasting should 

 be carried on at a temperature below the fusing point of the ore. 

 The ma«;netic ore melts into a slag at a cherry red heat. Care 

 should be taken not to reduce the ore to a slag while roasting, as 

 this slag is useless and even injurious in the reducing furnace. 

 The heat should be simply high enough to peroxidize the prot- 

 oxide, and dissipate volatile vapor. As a general rule, the higher 

 the state of oxydation, the more readily is the ore reduced. The 

 protoxide is very difficult of reduction. After the ore is properly 

 washed, it should be placed in a blast furnace, with a strong ba?e, 

 as lime, for a llux This base will act beneficially in combning 

 with silica and alumina, and thus prevent the formation of sili- 

 cates and aluminates of iron." 



The " Hall bed," or "75," as it is usually designated from the 

 nundicr of the li)t upon which it is situated, yields an ore of great 

 excellence, equal if not superior in quality to any in the Moiiah 

 district. It was formerly classed among the " lean ores," but is 

 now judged to afford a larger percentage than has been supposed 

 of i)ure ore. The bed embraces a nunilur of veins of various di- 

 mensions. Several are in close proximity to each other, and very 

 probably, it is inferred from their course, unite beneath the sur- 

 face in Ibrming a single '• breast." This ore when separated is in 



