10 JOURNAL OF THE 
to be oxalic acid. At the same time a number of small 
crystals were formed, which were mechanically separated, 
washed and dried. ‘These were analyzed and are report- 
edunder XIII. A further crop was gotten from the 
mother liquor, and the analysis is given under XIV. 
XIII. Vie 
7 PRG LSS A ian) RON SA 19.59 17.99 
BO e ee Ok ts aS 16.18 13.91 
GRRE GAR Ne. 2 8 64.23 68.09 
The curdy precipitate, which first formed, was also ex- 
amined and found to have the composition Zr(C,QO,),. 
201 OH)... 
The addition of a solution of potassium tetroxalate to 
zirconium chloride gave a gelatinous precipitate of zircon- 
ium oxalate (basic), carrying a little potassium oxalate. 
Subtracting the potassium oxalate, the percentages (X VI) 
Zr, 39.09 and C,O,, 38.63 are left, which are not very dif- 
ferent from the hgures gotten for the precipitate from 
potassium oxalate (neutral). 
This curdy gelatinous precipitate was dissolved in ex- 
cess of tetroxalate and the solution placed over sulphuric 
acid to crystallize, and yielled crystals having the com- 
position (X VIL); Gr, 20.85; K,.16.72; and C,O)462.8 bone 
will be seen, these are not far from the 1:2 zirconium 
potassium oxalate, with excess of oxalic acid. 
When potassium hydroxide was added toa solution of 
zirconium oxalate in oxalic acid until nearly neutral and 
then set aside for crystallization, various crops of crys- 
tals were gotten, as inthe case of the double sodium oxa- 
lates. These crops of crystals were similar in appear- 
ance to the sodium crystals. They were analyzed and 
showed fairly constant composition. 
(Zr(C2O4 )2)e- 
XVIII. De Boe XX. XXI. (KeC204)9.HeCoOnw. 
AY. 3 otek. 08 19.25 19,53 18.47 18.95 
Beets he A 16.41 16.35 14.84 14.46 16.34 
C204. .66.51 64.40 65.33 67.07 64.71 
The three previous analyses may also be referred to 
