166 Dr TURNER'S Chemical Examination 



Red oxide . . 86.85 

 Oxygen . . . 3.05 

 Water 10.10 



100.00. 



According to this analysis, manganite contains an oxide of 

 manganese, 89.9 parts of which yield 3.05 of oxygen, on being 

 converted into the red oxide. An equal quantity of pure dent- 

 oxide, in undergoing a similar change, should lose 2.997 of 

 oxygen. 



Exposed to a strong red heat and a current of hydrogen gas, 

 100 parts of manganite lost 19.09 parts in one experiment, and 

 19.07 in another. The mean is 19.08, and subtracting 10.10 as 

 water, 8.98 remain as oxygen. According to this analysis the 

 manganite is composed of 



Protoxide . . . 80.92 

 Oxygen . . . 8.98 

 Water 10.10 



100.00 

 Now as 80.92 : 8.98 : : 36 : 3.995. 



From the result of both analyses it is apparent that manganite, 

 in relation to manganese and oxygen, is a deutoxide. 



Also as 89.90 : 10.10 :: 40 : 4.494. 



The fourth number is so near 4.5, half an equivalent of water, 

 that we may safely regard manganite as a compound of 80 parts 

 or two equivalents of the deutoxide of manganese, and 9 parts 

 or one equivalent of water. 



