NOTE ON A NEW ELEMENT ALLTED TO MOLYBDENUM. .1 



after acidification and on boiling. The presence of the element 

 in the filtrate from the hydrogen sulphide group may, therefore, 

 be most probably ascribed to the incomplete heating during 

 precipitation by hydrogen sulphide. 



Preparation from Molybdenite of a Compound containing 

 the New Element and its Examination. 



As the condition, under which the supposed ammonium 

 vanadate was previously obtained, was such that it did not ensure 

 its separation quantitatively and in the pure state, supposing it 

 to be really ammonium vanadate, the following procedure has 

 been adopted. After igniting in oxygen, the powdered mineral 

 was extracted with ammonia. The residue, still containing some 

 unaltered mineral, was repeatedly boiled w^ith concentrated nitric 

 acid, and the whole evaporated to dryness and again extracted 

 with ammonia. The final residue, on digestion with ammonium 

 sulphide, gave a deep reddish brown solution, which was filtered 

 from the insoluble portion, containing the sulphides of lead, 

 bismuth (?), iron, nipponium and zinc, and the hydroxide of 

 aluminium. The dark brown precipitate, obtained on acidifying 

 the solution with hydrochloric acid and heating, was decomposed 

 wâth nitric acid, and the yellowish brown syrupy residue, left on 

 evaporation of the nitric acid solution, ignited in the air. The 

 dark brown residue thus obtained was fused with potassium 

 nitrate, and the fused mass extracted with water, when a small 

 quantity of a reddish brown substance, consisting chiefly of ferric 

 oxide, was left undissolved. The aqueous alkaline extract was 

 neutralised with nitric acid and, after concentration, mixed with 

 an equal volume of a saturated solution of ammonium chloride, 



