Taylor, Higher Oxide of Cobalt. 



the action of hydrogen dioxide on the monoxide of cobalt 

 in presence of potassium or sodium hydrogen carbonate, 

 of salts containing cobalt as CoO, (cobaltites), which 

 have a green colour when in solution, and are moderately 

 stable. They also conclude that cobalt dioxide is soluble 

 in water to a certain extent, forming an acid solution. 



From all of this it is plain that there is a wide irregu- 

 larity in the composition of the precipitated oxides of 

 cobalt. As I have already mentioned, that particular 

 oxide which is precipitated from a neutral solution of 

 cobalt by barium or calcium carbonate in presence of 

 bromine water is certainly higher than the sesquioxide. 

 I have made a great many determinations of the oxygen 

 in it, over and above that in the monoxide (all by Bunsen's 

 method), and I find that it is fairly constant in composi- 

 tion, and that its composition approximates pretty closely 

 to that represented by the formulee C07O11 and C03O14. 

 Which of these two more correctly represents the com- 

 position of the oxide I am not able to say. 



In the following Table are given the results of eleven 



