478 Miscellaneous Intelligence. 



tion precipitated by water. An analogy holds between these 

 three substances in this respect. 



Iodine, according to Bussy, also dissolves in sulphuric acid.-— 

 Annales de C/iimie, xxxvii. 189. 



9. On the Presence of Columhium as well as Titanium in Iron Slag. 

 —The iron slag of Konigshiitte, in Upper Silesia, has been exa- 

 mined by Professor Huiiefeld, in consequence of its having been 

 shown by Karsten to contain abundance of titanium, like that first 

 pointed out by Wollaston in the iron slags from South Wales. 

 But besides titanium. Professor Hiinefeld found great reason to 

 believe in the presence of columbium, or, as he calls it, tantalium, 

 in considerable quantities. Besides the cubes of titanium, he 

 found in the slag, 1. Granules of metal melted into it of the shape 

 of beans or s[)heres, weighing from 2 to 30 grains. 2. Cavities 

 of different sizes, the sides of which, when filed, had a steel lustre. 

 3. Grains of metal sprinkled through the slag, of a globular or 

 oblong shape, with a metallic lustre, and a colour between those 

 of silver and tin. In their chemical properties, they resembled the 

 small lustrous metallic bases before described ; they scratched 

 glass, gave a shining powder, and seemed, therefore, to be tanta- 

 lium, such as we have found it hitherto described. 4. Melted 

 grains of metal partly globular, with a tint verging upon the 

 colour of brass. 5. Portions of melted slag, of a dark rose-red 

 colour, which exhibited a fine lustre when filed, and were hard 

 and tough, but not malleable. 



No. 3 was the most striking of these products. The grains scarcely 

 lost anything in aqua regia, preserved their lustre, and did not 

 crumble. Similar granules, which remained behind in another ex- 

 periment with the same solvent, scratched glass, and, when beaten 

 and broken with a hammer, made red-hot with caustic potash, and 

 treated by the blowpipe as well as with humid tests, did not give 

 any indications of titanium. A portion, however, which had been 

 inelted with potash, and acidulated with nitric acid, the solution 

 exposed for several days to the air, and afterwards filtered, was, 

 by means of a solution of galls, precipitated rather abundantly of 

 a dirty orange colour, whilst hydrosulphuret of potash produced 

 a scarcely perceptible turbidity. 



Numbers 1, 2, 4, and 5 seemed to be different mixtures of iron, 

 titanium, and columbium. — Phil. Mag. N. S. iii. 121. 



' 10. On Electrical Phenomena produced by Pressure, and the 

 Cleavage of Crystals, by M. Becquerel. — In continuing researches 

 commenced, and in part published some years since, on the deve- 

 lopement of electricity by pressure, M.Becquerel's object has not 

 been to ascertain whether the electricity was due to any other cause 

 than that which is effective when friction is resorted to, but to see 

 tiow pressure, which may be considered as an element of friction. 



