124' Dr. Walchner on Metallic Titanium. 



e) The residue treated with potash in {d) had left some 

 traces of a reddish powder and of a few shining metallic leaves, 

 of the appearance of mica. This residue was heated with three 

 drops of nitric acid and a little water ; by which the reddish 

 powder was dissolved, but the metallic leaves still remained. 

 The solution of nitric acid was poured off, neutralized with a 

 little ammonia, and a black turbidity was imparted to it by a 

 current of sulphuretted hydrogen. It is therefore probable 

 that the reddish powder was a litde more red-lead. The re- 

 maining leaves of metal were now treated with one drop of 

 nitric acid and two drops of muriatic acid, by which they were 

 completely dissolved : we must consider them therefore as 

 gold-leaf, but in so small a quantity that it was impossible 

 to try any further experiment on them. 



From the foregoing examination it will appear that the 

 sealing-wax consisted for die most part of common wax, to 

 which a little gum and turpentine had been added, and which 

 seemed to have been coloured principally by red-lead ; con- 

 taining besides a few leaves of gold, which seemed to have been 

 added to enhance the beauty of the wax, although in very 

 small proportion. 



XVII. On Metallic Titanium. By Dr. Walchneu of Fri- 

 burg, ill the Breisgau*. 



MUNZING of this place gave me lately several spe- 

 « cimens of iron from tb.e foundries in the highlands of 

 Baden. Among these were, on a piece of slag from the bottom 

 of a furnace, several small cubic crystals of a middle tint be- 

 tween gold-yellow and copper- red, and with a strong metallic 

 lusti-e. Some of them exhibited stria? parallel to the sides of 

 the cube, and seemed to be of a darker hue. They were vei'y 

 hard, scratching glass very strongly, and rock-crystal visibly ; 

 but at the same time so brittle that the blow of a hammer re- 

 duced them to jjowder. Owing to the very small quantity in 

 my possession, I could not determine their specific gravity. 

 Heated separately by the blowpipe on charcoal, they could 

 not be melted ; but they lost their brilliancy by it, and be- 

 came brown to some distance from the part acted upon. 

 They also remained undissolved in glass of borax. Saltof phos- 

 phorus, by a continued heat at the point of the interior flame, 

 dissolved a small quantity. After treatment in the reducing 

 flame, the glass on cooling assumed a slight amethyst-colour. 



* From Schwciggcr's Journal, Band xi. n. 80. 



This 



