6 AKT. IG. — M. OGAWA : 



(4) After strongly acidifying the solution with nitric acid, 

 sodium phosphate gave a compound apparently similar to am- 

 monium phospho-molybdate. 



(5) In presence of potassium thiocyanate, zinc and hydro- 

 chloric acid gave a blood red colouration. 



Besides the above described reactions, which were observed 

 with an aqueous solution of the salt, the following must also be 

 mentioned. 



(6) The residue, obtained on heating the ammonium salt 

 and consisting of the oxide, either alone or mixed with molyb- 

 denum trioxide, did not possess the characteristic yellowish red 

 colour of vanadium pentoxide, but was similar in appearance to 

 molybdenum trioxide and slowly volatilised at a red heat, becoming 

 crystalline at the same time. It produced a deep blue colouration 

 on heating with concentrated sulphuric acid. 



(7) The oxide, Avhen heated in a current of hydrogen gas, 

 was reduced into the metal, which was non-fusible at a bright red 

 heat, and the metal could be easily brought back into the oxide 

 by heating it in the air. The equivalent weight of the metal 

 was determined, both by reducing the oxide into the metal and 

 by converting the metal back into the oxide ; the values obtained 

 were 16.4 and 16. G, not very far from the equivalent weight of 

 molybdenum. 



Thinking that the ammonium salt above obtained might be 

 a mixture of two salts, one containing molybdenum and the other 

 the unknown element, an attempt was made to separate them, 

 if possible, by fractional crystallisation. For this purpose, the 

 salt was again prepared according to the method already described, 

 collecting, however, one crop of crystals shortly after the addition 

 of ammonium chloride and without using alcohol, and another 



