8 ART. 16. M. OGAWA : 



and the residue dissolved in water. This aqueous solution gave 

 all the reactions described on page 5-6, with the exception of 

 the colour reactions mentioned in (2), (5) and (6), but these 

 reactions are exactly those which are characteristic of molybdenum. 

 It is true that a faint colouration was produced with zinc and 

 hydrochloric acid, in presence of potassium thiocyanate, but so 

 faint that, considering the delicacy of this colour reaction, we 

 may reasonably believe that almost every trace of molybdenum 

 has been removed and that the new element or, rather, its oxide 

 or the hydrated oxide has been obtained in an almost pure state. 



Froj^erties of the element. The supposed new element, obtain- 

 ed by heating the above described graphitic substance in a current 

 of hydrogen gas, has a metallic lustre and looks somewhat like 

 magnesium powder. It burns brilliantly when heated in the 

 air, producing the oxide, a part of which volatilises at the same 

 time. The oxide, when heated in hydrogen gas, reproduces the 

 metal in the form, however, of a gray powder, resembling 

 molybdenum, produced under like conditions. It is non-fusible 

 at a red heat. On prolonged boiling, it dissolves in concentrated 

 hydrochloric acid, producing a faint greenish-yellow solution. 

 In this latter respect, it is distinguished from molybdenum, which 

 is insoluble in the acid. The hydrochloric acid solution, on 

 evaporation to dryness at 100°, gives a white residue of the 

 chloride, soluble in water. This residue, on ignition, becomes 

 difficutly soluble, doubtless, due to its conversion into the oxide 

 or the oxychloride. 



The equivalent weight was again determined, using the 

 purified metal. (1) 0.1464 gr. of the metal gave 0.2149 gr. of 

 the oxide, from which the number 17.1 was calculated. (2) 

 0.2149 gr. of the oxide gave 0.1451 gr. of the metal, which led 



