the Analyses of M. Klaproth. 24 1 



A hundred parts of his ore are composed of 

 Blue oxide of manganese, at the maximum of 



oxidation it can retain in the fire, - 90*50 



Water - - - - - - 7 



Oxygen 4|^ cubic inches, or in weight - £>-25 



99-75 



This small quantity of oxygen in excess announces tha 

 this ore is of no v'alue for the purpose of extracting oxyjj-en 

 gas from it, or for preparing oxygenated muriatic acid. 



The seven per cent, of water constantly found in several 

 analyses is too large a quantity to be interposed only hy- 

 groscopically in the mineral. It oiight certainly to Be con- 

 sidered as the water of crystallization of that ore. 



, Analysis of the Manganese of Moravia. 



This ore is of a steel gray colour on the fracture when 

 fresh : it has a metallic lustre. It is composed of short 

 needles united in bundles, or diverging from a common 

 centre, and forming a compact mass. 



A hundred parts of the manganese of Mdravia contain 

 Black oxide of manganese, at the maximum of 



oxidation it can retain in the fire, - - 89 

 Water - - - - - - 0-50 



Oxygen 20i cubic inches^ or in weight - 10- 25 



99-75 



The gray radiated ores of manganese are those, there- 

 fore, which furnish the greatest abundance of oxygen. 



Analysis of the black earthy Ore of Manganese. 



This ore of the Harz is found in the fissures of the rocks, 

 like soft mud. But it soon dries in the air, and is con- 

 verted into fine black dust. 

 A hundred parts of it contain 



Brown oxide of manganese - 63 



Oxide of iron - - - - 6*50 



Charcoal _ _ - _ 1 



Barytcs ----- 1 



Silex ----- 8 



Water ----- 17-50 



102 



Vol. XVII. No. 67. Q The 



