8 JOURNAL OF THE 
stant composition (varying ratios of sodium to the zir- 
conium), or was decomposed by the washing. 
The analyses, calculated on a dry basis, gave: 
IV. Wie VI. 
Pere oreo pe es 53.12 46.86 41.98 
ier ab eperan , 9.16 4.10 1.07 
ea hanmetes NS Gam 38.06 39.64 42.95 
If the solution made with the excess of the sodium oxa- 
late was diluted considerably with water, a gelatinous pre- 
cipitate was formed, very fineandinsoluble. Precipitates 
were also formed by the addition of hydrochloric acid. 
This mode of forming the double oxalate was abandoned, 
and the following method was adopted with greater suc- 
cess. Zirconium hydroxide was dissolved in an excess of 
oxalic acid, and to this a concentrated solution of sodium 
hydroxide was added, bringing it nearly to neutralization. 
When the solution was concentrated an abundant 
crop of crystals was obtained on cooling, a good dal ef 
heat being evolved in the mixing. Further evaporation 
yielded other crops of crystals. These were washed, dried 
between filter paper andanalyzed. The results are given 
in the following table: 
VIL. VIII. OS. Calculated. 
iC ere os - 18.14 17.46 WS 18.19 
Pi Go os Wats. eile 12.59 12.66 12.78 11.93 
an Od ae cae Oe 69.27 ° 66.89 69.47 69.88 
These resuits show a somewhat wide variation from 
those calculated. This probably arises from the fact 
that the fractions were not composed of the crystals of a 
single kind of oxalate, but had other oxalates mixed with 
them in small amounts. Examined under a magnifying 
olass they seemed to be homogeneous, but the different 
crops could not be distingu’shed from one another. They 
were all small, hard prismatic crystals, somewhat difh- 
cultly soluble in water. One set of crystals, the aualy- 
sis of which is reported under VII in the above table, was 
