lron~slag of Kbnigshutte, in Upper Silesia. 123 



cooling. Sulpho-cyanate of potash dissolved in alcohol pro- 

 duced a red colour; with a greater addition, a dark rose colour ; 

 but with impure sulpho-cyanate of potash (still containing ferro- 

 prussiate of potash), a greenish white precipitate; with the 

 ferroprussiate of potash itself a dark grass green precipitate, 

 which was in part dissolved in the remaining liquid, giving it 

 the same colour ; and it was also dissolved by nitric acid. This 

 last solution turned gradually brownish green *. Another so- 

 lution made with muriatic acid, gave, by contact with a cylin- 

 der of zinc, the usual indications of titanium. 



The black powder b was digested in aqua regia, which ex- 

 tracted the iron and manganese, leaving however a consider- 

 able proportion of a black powder, which under the burnisher 

 gave an iron-gray streak of a metallic lustre, became inflamed 

 even before it arrived at a red heat, and yielded a whitish sub- 

 stance, which, with a few deviations, bore the characters of 

 tantalic acid. These deviations were probably produced by a 

 small portion of manganese, which was indicated in the trial 

 by the blowpipe. 



I subsequently obtained, through the friend above men- 

 tioned, a larger quantity of slag containing titanium. It had 

 a still greater quantity of large and small regular cubes of 

 titanium, which were affixed on the outside as well as to the 

 inner cavities of the slag. They had nearly all the same regu- 

 lar form and the rose copper colour, except a few very small 

 groups, which tended somewhat to an orange tint, and had 

 but a faint brilliancy (sulphuret of titanium ?). But besides 

 these visible crystallizations of titanium, the slag had some 

 other interesting substances upon it. 



1. Granules of metal melted into it of the shape of beans 

 or spheres, weighing from two to thirty grains. 



2. Cavities of different sizes, the sides of which, when filed, 

 had a fine lustre as of steel. 



3. Several grains of metal as it were sprinkled in the slag, of 

 a globular or oblong shape, with a metallic lustre, and a colour 

 between that of silver and that of tin. In their chemical pro- 

 perties they resembled the small lustrous metallic leaves which 

 have been mentioned above; they scratched glass, gave a 

 shining powder, and seemed therefore to be tantalium, such 

 as we have found it hitherto described. 



4. Melted grains of metal, partly globular, with a tint ver- 

 ging upon the colour of brass. 



5. Portions of melted blag, of a dark rose red nearly. They 



* See Pfaff's Neue Versuche uber das Vcrhalten der Titans'dure gegen ver- 

 schiedene rcagentien (New Experiments on the Habitudes of Titanic Acid 

 with different re-agents); Jahrb. b. xv. p. 372; and Pfaff's Analyt. Chem. 

 b. ii. p. 523. 



R2 all 



