436 Miscellaneous Intelligence. 



CarboTiate of manganese from Freyberg gave, 



Protoxide of manganese .510, or Carb. manganese . .822 



Ditto of iron . . . .045 Carb. iron . . . .073 



Lime 050 Carb. lime . . . .089 



Magnesia 008 Carb. magnesia . . .016 



Carbonic acid . . .387 



, 1.000 



l.OCO ^nn. des Mw.vi., 5^4. 



3. Native Chronates of Iron. — ^The following is the composition 

 of two chronates of iron, analysed by M. Berthier, the first from 

 St. Domingo, the second from Baltimore. 



Peroxide of iron . . . .370 . . . .350 



Oxide of chromium . . .360 . . . .5\6 



Aluraine 215 • . . .100 



Silica 050 . . . .030 



.995 ~990 



Ann. des Min. vi,, 577. 



4. Hydrate of Alumina. — A native hydrate of alumina, from 

 Beaux department des Bouches-du-Rbone, analysed by M. Ber- 

 thier, gave. 



Alumina 520 



Water 204 



Peroxide of iron 276 



Oxide of chrome, a trace 



1.000 

 M. Borthicr considers the oxide of iron as merely mixed with 

 the mineral ; its true constitution therefore is^ 



Aluniine 72 



Water 28 



The mineral occurs in pieces of indeterminate form, and some- 

 times in round grains, agglutinated by a paste of the same nature, 

 penetrated by carbonate of lime. The ferruginous matter is of a 

 blood-ri'd colour, its fracture uniform and shining, never radiated, 

 its specific gravity small and variable. — Jour. deMin. vi., 531. 



5. Natixe Nitrate of Soda. — An immense quantity cf nitrate of 

 soda has been discovered in Peru, in the district of Jarapaca, a 

 short distance from the frontiers of Chili. It forms a bed many 

 feet in thickness, which in many places appears at the surface of 

 the soil, and occupies an extent of forty leagues. The salt is 

 found sometimes etifloresced, sometimes crystallised, but most 

 frequently mingleci with clay and sand. It is bitter, and deli- 

 quescent ; it contains a little sulphate of soda. 



The site of the mineral salt is about three days journey from 

 Conception, a part of Chili, and from Iquiqui, a part of Peru 



