ELISHA MITCHELL SCIENTIFIC SOCIETY. f | 
here as having approximately the same composition. See 
analyses XIII, XIV, XVII. These are calculated as 
water-{rce. In the analyses XVIII and XIX the per- 
centages of water were 12.99 and 12.38. These would 
correspond to the formula (Gr(C,O,)2).(K,C,O,)5. HeC,O,. 
8H,O. In thiscase, as in the zirconium oxalates and the 
sodium oxalates, the crystals seem to form only along 
with free oxalic acid, giving acid salts. 
ZIRCONIUM AMMONIUM OXALATES. 
The addition of a solution of ammonium oxalate to the 
slightly acid solution of zirconium chloride gave a_ heavy 
evelatinous precipitate which was soluble in excess of am- 
mouium oxalate and proved to be zirconium hydroxide 
with more or less zirconium oxalate and small amounts of 
ammonia. ‘The filtrate from this precipitate was evap- 
orated slowly and a fine crystalline powder obtained. 
This contained (X XII) Zr,42.17 per cent. and C,O,, 39.86 
ver cent. This isin fair agreement with Zr,(C,O,),.Zr 
(OH),. When ammonium oxalate is added until the first 
gelatinous precipitate is redissolved and then evaporated 
to crystallization, different crops of crystals can be got- 
ten containing various amounts of ammonia. These did 
not seem to have any regular composition in our experi- 
ments and were looked upon as basic zirconium oxalates 
with varying. amounts of ammonium oxalate present. 
Thus for one of these the figures (XVIID Zr, 31.48; 
NH,, 7.14; and C,O,, 61.38 were gotten. 
Abandoning this method and using the one adopted in 
the cases of the sodium and potassium double oxalates, a 
more favorable result was optained. Zirconium hydroxide 
was dissolved in excess of oxalic acid and then this was | 
nearly neutralizel by means of ammonium hydroxide, 
Analyses of these crops of crystals follow: 
Zr.(C gO i)o- 
XXIV. SRV: 2 (NEw sCeOy: 
CS ee ene ee ae ae a 16.55 16.66 17.58 
1 RS ia ee ae 14.46 fy 35 13.28 
Fe 2 ne a se 69.99 69.99 (8.94 
