Iron-slag of Kmiigshiitte, in Upper Silesia. 125 



their lustre, and did not crumble. Similar granules remained 

 behind in another experiment with the same solvent, scratched 

 glass, and when beaten and broken with a hammer, made red 

 hot with caustic potash, and treated with the blowpipe appara- 

 tus as well as with humid re-agents, did not give any indications 

 of titanium. A portion, however, having been melted with pot- 

 ash, and acidulated with nitric acid, the solution remained for 

 several days exposed to the air, and being afterwards filtered, 

 was by means of a solution of galls precipitated rather abun- 

 dantly, of a dirty orange colour; whilst hydrosulphuret of pot- 

 ash produced a scarcely perceptible turbidity (tantaliumP). 



No. 4. — The brass colour was only superficial, the mass un- 

 derneath almost entirely resembling Nos. 2 and 3. 



No. 5. — The dark rose red, yellowish, and metallic colour of 

 these pieces extended deeper in the last-mentioned portions ; 

 they evidently contained titanium, were more difficultly filed, 

 were magnetic, and might contain a mixture of iron and tita- 

 nium on the surface, one of tantalium and iron, and some ti- 

 tanium itself further in. 



The black powder obtained from the portion of slag of the 

 other mass, was ignited with carbonate of soda; the mass, 

 which when cold appeared white with blueish green margins, 

 was dissolved in water, in which the green colour, which is 

 the property of manganese, disappeared. A white, somewhat 

 loose and flaky powder was precipitated. The remaining fluid, 

 mixed with muriatic acid, when treated with oxalate and ferro- 

 prussiate of potash, gave a yellowish red precipitate, small in 

 quantity. The fluid, when exposed to the atmosphere, turned 

 to a fine grass-green, without the least deposit of cyanuret of 

 iron ; it was not acid. An infusion of galls produced a dirty 

 yellowish white precipitate, which after some time became 

 grayish white, and subsequently yellowish green. Sulpho- 

 cyanate of potash produced a reddish deposit. Neither the 

 solution nor the precipitate gave any indications of titanium 

 on being treated with salt of phosphorus ; nor even after a 

 short contact with a cylinder of zinc, tin or iron, muriatic acid 

 having first been added to the solution. But on mixing an- 

 other portion of the dissolved mass with nitric acid, drying it 

 and treating it with salt of phosphorus and tin before the blow- 

 pipe, I obtained, by adding a little oxide of iron, a glass of a 

 hyacinth colour, which by a greater addition of the evaporated 

 solution, turned to a violet blue, and became almost transpa- 

 rent. 



On comparing these experiments with the slag, with the 

 known chemical properties of the substances, it is evident that 

 they contained not only an abundance of titanium (as has been 



shown 



