280 Ileadden — Tungstous Oxide, new Oxide of Tungsten. 



Aet. XXXIII. — Tungstous Oxide — a new Oxide of Tungsten 

 — associated with Coluinbous Oxide;* by "Wm. P. Headden. 



Ix an article on some tin and iron compounds, an abstract 

 of which appeared in this Journal, f reference was made to 

 certain products as iron bottoms whose formation was then 

 discussed at sufficient length. This paper is practically a study 

 of the residues obtained from those bottoms. 



The residues as obtained after having been freed from car- 

 bon and the portion which was so fine that it remained in 

 suspension for a longer time, consisted of two parts, a heavier 

 and a lighter. The specifically lighter one was quite readily 

 attacked by hydric nitrate and the whole of the residues from 

 the first two bottoms were treated with this salt in order to 

 obtain the heavier portion as pure as possible. 



The final residue from the first bottom was a brownish gray, 

 very fine, crystalline, and wholly non-magnetic powder which 

 under a magnification of 140 diameters, appeared to consist of 

 prisms. It was examined after being ignited and found to 

 contain columbic acid with a small quantity of tungstic acid 

 and a very little iron and tin but no tantalic acid. 



The residue from the second bottom was treated in a like 

 way. The solution obtained by treating it with warm dilute 

 hydric nitrate indicated the presence of compounds of tin and 

 iron rich in the latter element. The tin went into solution 

 and a small quantity of tungstic acid was formed ; but it is 

 uncertain whether it was derived from the soluble compounds 

 or from the portion which remained as insoluble. I think that 

 it was derived from the latter. The gray, crystalline residue, 

 insoluble in warm dilute hydric nitrate was treated successively 

 with cold concentrated hydric nitrate, aqua regia, water, and 

 alcohol, and gave when subsequently treated with cold concen- 

 trated hydric chloride sp. gr. 1*2 a deep blue but clear solu- 

 tion, whose color was discharged by dilution with water and 

 also upon being heated. The greater portion of this residue 

 was strongly magnetic, the rest of it, however, was not at- 

 tracted by the magnet. I could observe no difference in the 

 form of the grains and crystals in the two portions. These 

 were divided, by carefully washing them, into a finer crystal- 

 line and a coarser, well crystallized portion. The crystals are 

 triangular prisms whose height is often several times the alti- 



* Abstract of an article read before the Colorado Scientific Society, January 

 meeting, 1893. 

 f Vol. xliv. p. 464. 



