TITANIUM. 123 



hot in platinum vessels gave for the atomic weight 59.1 

 and 58.96. The tin employed was prepared from pure 

 chloride. Two experiments on the titration of the chlo- 

 ride with argentic nitrate gave 59.06 and 59.03. Ag = 

 108, CI = 35.^5. {AiinaL de Chim. et de Phys., (3,) 55, 1859, 

 156.) 



TITANIUM. 



The specific heat of titanic acid has been determined by 

 Regnault and by Kopp, and indicates an atomic weight of 

 about 50. Dumas determined the vapor density of the 

 tetrachloride at 6.836. [If the molecular weight of O = 

 32, and if CI = 35.457, this gives Ti = 56.025.] [Gmelin- 

 Kraut, I. c, and Foggend. Ann., 9, 1827, 441.) 



H. Rose : 61.17 (0 = 16). 



Determined by roasting titanium sulphide and weighing 

 the titanic acid formed. The highest result obtained was 

 1.017 sulphide from 0.757 acid. This result Rose adopted on 

 the supposition that an excess was impossible. For S = 

 201.16 these data give Ti = 62.25 (0 = 16) ; 389.1 ( = 

 100.) [If S = 32,Ti=:61.17.] The sulphide was prepared 

 by heatino; titanic acid in a current of carbon disulphide. 

 {Gilberts Ann., 7S, 1823, 135.) 



Rose subsequently expressed the opinion that the sulphide 

 employed in this analysis was impure, and contained unde- 

 composed titanic acid, but afterwards came to the conclu- 

 sion that it was perfectly pure, accounting for the variation 

 of the results from those he obtained later by the theory 

 that the sulphide and the oxide of this element, like those 

 of tantalium, were entirely dissimilar compounds. Marig- 

 nac has shown that tantalium sulphide is of normal consti- 

 tution. {Poggend. Ann., 99, 1856, 576.) 



H. Rose: 48.28 (0 = 16). 



Titanium chloride was decomposed with water, titanic 

 acid precipitated by amm(5nic hydrate, and the chlorine 

 precipitated from the filtrate with argentic nitrate. Taking 

 Ag =^ 1351.607, CI = 221.325 ; Rose calculated the chlorine 

 contents in four experiments at from 74.43 to 74.53 per 



