70 
DR. E. rRAJ\’'KLAiS^D’S RESEARCHES OX ORGAXO-^IETALLIC BODIES. 
needles of dinitroethylate of lime, wtiich contain three atoms of water, two of which are 
expelled at 100° C. An estimation of hme in this salt gave 20‘76 per cent. ; the above 
formula requires 20 ’5 9 per cent. 
Dinitroethylate of Silver 
is produced by double decomposition from dinitroethylate of baryta and sulphate of 
silver. It is very soluble in water, crystalhzes in veiy hght scales, and is so speedily 
decomposed, even with little exposure to hght, that no satisfactoiy analysis could be 
made. 
Double Nitrate and Dinitroethylate of Silver. 
Ag 0 N 0 ,+Ag 0 N,C,H 303 . 
This salt is very sparingly soluble in water ; it .is precipitated in a ciystalline granular 
form when concentrated solutions of dinitroethylate of zinc and nitrate of silver ai-e 
mixed. The precipitated salt, washed on a filter vdth distilled water and dried by 
pressure between bibulous paper, yielded the following analytical results : — 
I. -3850 grm., burnt with oxide of copper, gave ‘0941 grm. carbonic acid and -0500 
grm. water. 
II. T817 grm. gave, on ignition, T070 grm. metallic silver. 
These numbers agree closely with the above formula. 
Calculated. 
C. . 
. . 24 
6-54 
6-67 
H, . 
. . 5 
1-36 
1-36 
N 3 . 
. . 42 
Ag 2 • 
. . 215-94 
58-85 
O.o . 
. . 80 
366-94 
Found. 
. 
II. 
58-89 
Dinitroethylate of Copper. 
2 (N 3 aH 3 CuOJ+HO. 
This salt is prepared by mixing solutions of dinitroethylate of bai-yta and sidphate of 
copper. The filtered solution is of a magnificent purple colour- ; on evaporation in vacuo 
it yields splendid purple needles, which contain half an equivalent of water, and may be 
obtained several inches in length ; they are four-sided prisms. These crystals, separated 
from the mother-liquor, and dried by exposm-e over sulphmic acid in vacuo, gave the 
following numbers on analysis : — 
I. -2249 grm., burnt with oxide of copper, gave -1616 grm. carbonic acid and 
-0795 grm. water. 
II. -3038 grm. yielded by Simpson’s method 84 cubic centimetres dry nitrogen at 
