44 



Titanic acid, hitherto universally represented as a binoxide Ti0 2 , 

 would then assume the formula 



in perfect analogy with that of silicic acid. 



The equivalent of titanium would then be changed from 24*29, 

 the number at present adopted, to 36 '39. The protoxide of tita- 

 nium would in this case become a sesquioxide, and the compound 

 hitherto viewed as sesquioxide would have to be considered as an in- 

 termediate oxide as a combination of the sesquioxide with the ter- 

 oxide, in fact, as a bititanate of sesquioxide of titanium. 



Formula of the Titanium Compounds. 



Old Notation. New Notation. 



Ti=24-29 Ti=36-39. 



TiO ' First oxide Ti 2 O 3 



Ti 2 O 3 Second oxide Ti 4 O 9 =Ti 2 O 3 , 2TiO 3 



Ti O 2 Acid Ti O 3 



Ti C1 2 Chloride Ti C1 3 



Ti Br 2 Bromide Ti Br 3 . 



It is scarcely necessary to observe, that an alteration of the equiva- 

 lent of titanium on the ground of the difference of the two boiling- 

 points, would be hazardous, if not supported by additional experi- 

 mental evidence, and that further researches on the series of titanium 

 are required in order to establish whether the proposed alteration 

 actually affords a simpler expression for the combining relations of 

 this remarkable element. 



