Chemical Science. 157 



dining the apparatus. The fluid was transpai*ent, ' colourless, 

 possessing considerable density, evolving dense fumes in the at- 

 mosphere, having a pungent odour resembling that of chlorine : 

 the fumes depend upon the presence of moisture : it boils a little 

 above 212°, and condenses without further change. A drop of 

 water added to a few drops of the liquid caused rapid disengage- 

 ment of chlorine, much heat, and the production of a solid salt. 

 This salt is deliquescent, soluble in water, the solution having 

 all the properties of muriate of titanium. It yields a broAvnish- 

 red precipitate with prussiate of potash, a dark red with infu- 

 sion of galls, with pure potash a gelatinous precipitate, soluble 

 in excess of muriatic acid; ammonia throws down a white pre- 

 cipitate. When the chlorine is not dry, the same salt crystal- 

 lizes in the tube. Into a long test tube, 14.6 grains of the fluid 

 were introduced, and afterwards a weighed portion of water 

 added very gradually ; chlorine was rapidly disengaged, and heat 

 produced. When cold, the loss was found to be four grains, 

 and the solution gave a dark-red precipitate with gallic acid. 

 The fluid, therefore, is a perchloride of titanium, which, by losing 

 chlorine, becomes a protochloride, and that by solution in water 

 a muriate. 



Water was added to a solution of the muriate formed by the 

 decomposition of the perchloride by water, and the solution di- 

 vided into two equal parts : the one decomposed by potash gave 

 7 grains oxide of titanium ; the other, by nitrate of silver, gave 

 15 grains chloride of silverrrS.G chlorine. The muriate, there- 

 fore, contains oxide of titanium, 7 ; muriatic acid, 3.74. Sup- 

 posing the muriate to contain one atom acid, and one atom oxide, 

 the latter will be the protoxide, and the weight of titanium will 

 be 61.2. Probably, the true number is 64, as indicated by Mr. 

 Rose's experiments. 



T.T . . r Oxide of Titanium . . 7.00 



Muriate. { Muriatic acid . . . 3.74 



■o i 1-1 'J f Titanium 6.12 



Protochloride. s rn i • «^^ 



I Chlorine 3.64 



■D 1 1 .J f Titanium Q.Q6 



Perchloride. { ^^^^^.^^^ ^^^ 



Ann. Phil. N. S. ix. IS. 



19. Pcschier on Titanium in Mica.-^ln consequence of the 

 results obtained and published by M. Vauquelin*, with regard 

 to the presence and the quantity of titanium in various specimens 

 of mica, M. Peschier, to whose results those of M. Vauquelin's 

 are opposed, has published the process by which lie separates 



♦ Quarterly Journal of Science, vol. xviii. p. 392. 



