ELISHA MITCHELL SCIENTIFIC SOCIETY. 9 
redissolved in water and recrystallized. On analysis it 
yielded the following results: 
WHE; 1ige 
ember, Gents Sh Aye Se ed ANS 18.14 18.19 
oy ss sale aay iia OR PT ae 12.59 12.71 
See, aes eee PPE IE eat 69.27 69.10 
These were calculated upon a water-free basis. The 
crystals from the various crops mentioned above did not 
contain a very constant amount of water, but ranged from 
9.13 to 11.06. The calculated amount of water in Zr 
fe, 3Na,),. 5.0 is 10,62. It would seem,  there- 
fore, that the tendency, when this method of formation is 
adopted, is toward the formation of crystals containing 
free oxalicacid and with the sodium and zirconium oxalates 
bearing a ratio ot three to one. 
ZIRCONIUM POTASSIUM OXALATE 
Tie curdy precipitate gotten by precipitating zircon- 
inm chloride with normai potassium oxalate is iusoluble 
in an excess of either of the substances. The precipitate 
first obtained is an impure zirconium hydroxide, contain- 
ing only small amounts of oxalic acid. The supernatant 
liquid on concentration yields needle-like crystals of po- 
tassium oxalate, carrying only traces of zirconium. Af- 
ter the separation of a good deal of this potassium oxalate, 
further concentration yielded a gelatinous substance 
having thecomposition (XII): Zr, 39.34; K, 5.06; C,O,, 
43.05; which seems to be a basic zirconium oxalate, mixed 
or united with a small proportion of potassium oxalate. 
If the potassium be calculated as potassium oxalate and 
subtracted, the composition of the remainder would be 
approximately Zr (OH),. Zr(C,O,).. 
On adding potassium binoxalate to a solution of zircon- 
ium chloridea white curdy precipitate was obtained which 
was not completely soluble in excess of the binoxalate. 
The somewhat turbid solution was filtered and evapor- 
.ated. Large crystals resembling those of oxalic acid 
formed. ‘These were separated, and on analysis proved 
