0IS4LmTE AND TITANIUM. 323 



soluble in acids and form triple salts which are easily 

 decomposed by moderate heat. 



After having dissolved titanium and oisanite separate- The muriatic 

 ly in muriatic acid, he subjected them to the action of ^° "g^"°^^^^.^._ 

 various re-agents. He remarked that both were precipi- tate by galls, 



tated of a fine blood red, by the infusion of nut galls; but ^"t the pred- 



T J o ' pitates with 



that the solution of oisanite afforded a yellowish brown prussiatc diiFer 

 precipitate with prussiate of potash, while the solution of pwing to iron 

 titanium formed a very deep green precipitate with the 

 same re-agent. The author suspected that this last co- ^ 



lour might arise from a portion of iron contained in the 

 titanium ; he mixed a h"^ drops of muriate of iron with 

 the solution of oisanite, and he then obtained a green co- 

 lour entirely similar to that which the titanium had exhi- 

 bited. After having evaporated the solution of titanium 

 to dryness, he was^hed the residue with distilled water, 

 and obtained a yellow liquid, leaving behind a white sub- 

 stance insoluble in water and the acids; but this matter 

 being again fused with potash and washed io carry off 

 the excess of alkali, was easily dissolved in acids. 



The liquor arising from the solution of titanium eva- They do not 

 porated to dryness, precipitated a blueish green with differ when pu- 

 prussiate of potash ; the solution of the residue being 

 again fused with potash, was, on the contrary, precipi- 

 tated of a yellowish brown, like that of oisanite, by the 

 same agent and not green as before. 



By this operation, M. Vauquelin having separated the oisanite Is 

 iron from titanium, the solution of the latter then present- therefore the 

 ed absolutely the same proper-ties as those of oisanite. ^^^ aJnu?"ita- 

 Hence he concludes that the only difference between oi- nium. 

 sanite and titanium consists in a small quantity of iron 

 and of manganese contained in the latter ; but he doubts 

 whether these substances be the cause of the form which 

 distinguishes the oisanite ; for these ii^ipurities are very 

 small in quantity and maybe for the most part separated 

 by muriatic acid. 



From these experiments of Vauquelin, it is necessary 

 thai oisanite s'>ould be removed from the class of stones 

 and placed in that of the metals, under the genus titanium, 

 of which it ought to constitute the lirst species, 



X X 2 The 



