376 Miscellanies, 



Cast iron, 

 Scoria, 



}^;^^ I Total, 29.62 



Fluxes added, - - - 13.74 Oxygen, 4.32 



Foreign matters with the iron, 3.68=0.184. 

 These 0.184 of foreign matters are oxide of titanium and quartz. 

 The proportion of quartz having been found to be 0.020 by the wet 

 process, there remain .164 of oxide of titanium ; by sulphuric acid, 

 the quantity was .166 : thus, the two methods agree remarkably well, 

 especially as we know that by contact with charcoal, oxide of tita- 

 nium loses a certain quantity, very small, it is true, of its oxygen. 



The iron was white, and a litde crystalline, but very tenacious, 

 flattening under the hammer before it broke. The scoria was vitre- 

 ous, of a shining black, and opake, with a copper colored surface. 



12 gr. of iron would take 3.54 gr. of oxygen to convert it into 

 protoxide, 4.70 gr. to change it into magnetic oxide, and 5.31 gr. 

 to peroxide. The loss in the assay having been 4.32 gr. it follows 

 that the iron, in the mineral, is partly protoxide and partly magnetic 

 oxide. This mineral is therefore composed, like other varieties of 

 titaniferous iron, of titanate and ferrate of protoxide of iron ; it 

 contains, 



Metallic iron, - - - - - .600 

 Oxygen, - ... - ^ .214 

 Titanic acid, - - - - - .166 



Quartz, - . . , . - .020 



1.000 



A specimen which produced a red powder, gave on trial .23 oxy- 

 gen to .556 metallic iron, shewing that in this fer titane was mixed 

 with peroxide of iron. 



It would be interesting to science to have fresh trials of this min- 

 eral made in a smelting furnace, to ascertain what proportion of tita- 

 nium would remain in a state of protoxide in the scoria and of that 

 which might be reduced to the metallic state. — Jlnnales des Mines, 

 torn. 3, p. 39. 



2. Mines of Freyberg in Saxony. — The mines of Beschertgliick 

 and Himmelf iirst, which have been for a long time, among the most 

 important resources of Saxony, are now greatly reduced ; but, on 

 the other hand, new mines have become flourishing. 



