124 Prof. Hunefeld on the Titaniferons 



all showed, on being filed, a fine metallic lustre, were very 

 hard and tough, but not malleable, some scratching glass di- 

 stinctly, others but feebly. 



No. 1. — The metallic granule was attracted by the magnet, 

 showed, when filed, a bright steel-lustre, which continued in 

 the air ; it was very hard, not ductile, but after many blows 

 with a hammer, flew into several pieces, and showed a fine- 

 grained fracture. These fragments could not be melted even 

 in the most intense flame of the blow-pipe ; they only became 

 slightly diminished in lustre. Treated with muriatic acid, 

 they yielded odorous hydrogen ; the muriatic acid dissolved 

 iron, the granule turned black, and after a longer digestion 

 crumbled into a black dust. In aqua regia, a little more was 

 dissolved ; about five-sixths remained, which, when washed 

 and polished with a glass stick, gave a streak of a metallic 

 lustre similar to molybdena. When moistened, it gave a 

 smell of hydrogen gas, such as is given by manganese. Thus 

 it remains undecided whether this quality belongs to a small 

 residuum of manganese, which however is probably the case, 

 since the black powder treated with salt of phosphorus yielded 

 a pearl of a faint amethyst colour, whilst otherwise nearly 

 the whole covered the pearl of salt of phosphorus with a me- 

 tallic pellicle ; and this result remained unchanged on the ex- 

 periment being continued. Treated with soda and borax, no 

 other re-action took place but that of the salt being covered 

 with a metallic pellicle, which remained unchanged even after 

 the pearl had been repeatedly touched with solution of caustic 

 potash, and a scrap of tin added to it. If, however, the granule 

 of slag had not been sufficiently treated with aqua regia, the 

 black metallic powder gave a blueish green substance with 

 soda, with salt of phosphorus, a yellowish brown pearl in the 

 external flame, a greenish one becoming clear on cooling in 

 the inner flame, and which therefore contained iron and man- 

 ganese. 



After several experiments made with the black powder, I 

 could perceive, at least in this manner, no indication of tita- 

 nium ; but another granule, also treated with aqua regia, left 

 undissolved small rose copper coloured crystals of titanium. 

 Another piece of a melted granule in the titaniferous slag gave 

 on the filed surface visible particles of titanium, as it were 

 sprinkled among it. The granule just described could be filed 

 like the other portions described in what follows, adhering a 

 little to the file. 



No. 2. — These parts proved to be almost entirely the same 

 as the former, but were a little harder, and yielded more of 

 the black metallic powder. 



No. 3. — They scarcely lost any thing in aqua regia, preserved 



their 



