.1823.] M. Rose on Titanium. 373; 



ficially, but which are formed by nature, as in the dathoHte and 

 botryolite. This compound is readily soluble at common tem- 

 peratures in muriatic acid ; it is analogous to sphene, which 

 is composed of titanic acid, silica, and lime. 



Experiments to reduce Titanic Acid, and to combine Titanium 

 with Sulphur. 



MM. Hecht, Vauquelin, and Laugier, tried to reduce titanic 

 acid by charcoal; they obtained principally carburet of tita- 

 nium with a small quantity of metaUic titanium ; which indeed 

 was scarcely proved. Having found this product to be insoluble 

 in acids, and even in aqua regia, they could not determine the 

 quantity of oxygen contained in titanic acid. The carburet of 

 titanium even if burnt in oxygen gas, would not have given cor- 

 rect results, this product being probably mixed with much 

 titanic acid. 



MM. Faraday and Stodart, in their experiments upon steel, 

 have in vain attempted to alloy iron with titanium, and Vauque- 

 lin and Hecht had previously failed. M. Rose could not succeed 

 in alloying zinc with titanium. Sulphuretted hydrogen did not 

 at all act upon titanic acid ; a black powder was formed, but no 

 sulphuret of titanium, nor was a sulphuret produced by fusing 

 sulphuret of potassium with the titanic acid. 



M. Rose at last succeeded in forming the sulphuret by passing 

 sulphuret of carbon over titanic acid strongly heated in a porce- 

 lain tube. This sulphuret is of a deep green colour ; when 

 rubbed with a hard body, it assumes a very strong metallic 

 lustre resembling brass. When heated in contact with atmo- 

 spheric air, it burns with a sulphurous flame, and is converted 

 into titanic acid. When heated in a small narrow-necked retort, 

 a small quantity of sulphur is separated if the aperture be closed, 

 but not otherwise. It becomes very hot when nitric acid is 

 poured upon it ; nitrous vapours are emitted, the fluid becomes 

 milky, and titanic acid is deposited in the state of a fine powder ; 

 when the fluid is boiled, the sulphur melts, and aggregates into 

 small masses. 



This sulphuret of titanium w^as analysed by combustion upon 

 platina by means of a spirit lamp ; 1*017 of pure and solid sul- 

 phuret of titanium gave 0*767 of pure titanic acid. 



Calculating upon the results of this experiment, M.Rose 

 concludes that titanic acid is composed of 



Titanium « . 66*05 



Oxygen 33*95 



100^ 

 And the sulphuret of 



Titanium 49-17 



Sulphur . , 50-83 



100-00 



