ELISHA MITCHELL SCIENTIFIC SOCIETY. bi 
tallizations, but the last crystallization, when nearly the 
whole would solidify into a crystalline mass, showed 
decreased percentages of zirconium. It is possible that 
larger amounts than we had at our disposal would enable 
one to so fraction the crystalizations as to secure a pure 
oxalate. It is, however questionable whether the normal 
oxalate can exist in solution without admixture with some 
oxalic acid. | 
Four series of crystallizations were made, and in two 
cases fairly abundant crops of crystals corresponding to 
the acid oxalate were obtained. In each series enough of 
the zirconium hydroxide was taken to form about twenty 
erams ot the oxalate. | 
First series. Second series. 
Sixth faaction. Fifth fraction. 
5 Il. mr. Zr(CagO4)o.HeCoO,q. 
ES ae acaiese teks Glee UN, « 6 os > Se 25.28 20.53 
ys AS ee 2 74.55 W512 74.47 
These are calculated upon the water-free basis. The 
crystals contained 29.34 and 29.27 per cent. of water 
respectively, where the salt Zr(C,O,),.H,C,O,.8H,O con- 
tains 28.90 per cent. Other crops of crystals contained 
percentages of zirconium not ‘varying greatly from those 
@iven above as 28.14, 27.62, 24.9, 23.83. The percentage 
of zirconium in the normal oxalate is 33.96. 
ZIRCONIUM SODIUM OXALATE. 
The addition of sodium oxalate toa slightly acid solu- 
tion of zirconium chloride gives a gelatinous white pre- 
cipitate. Most of this dissolves in an excess of the oxa- 
late. ‘The undissolved portion settles to the bottom, and 
after prolonged standing, a second layer of a more pow- 
dery appearance forms. This can also be gotten by con- 
centration of the filtrate from the first precipitate. An- 
alysis showed that the first gelatinous precipitate was 
chiefly Zr(OH),. The second precipitate was a double 
oxalate of zirconium and sodium, but was either of incon- 
