CRYSTALLINE CONSTITUENTS OF OPIUM. 373 
{ 4-522 grains of the double salt gave 


2984 ... silver. 
Experiment. Calculation. 
Carbon, : é 20:92 20:95 Ci, 96 
Hydrogen, . : 3°20 1:30 6 
Nitrogen, . : air 6-11 INE 28 
Oxygen, : : Joa 24°44 0O,, 122 
Silver, : ; 49-70 - 47-20 Ag, 216-2 
100-00 458-2 






This analysis, though far from correct, gives a sufficient approximation to 
theory to shew that the substance actually is a double compound, and the presence 
of nitric acid in it can be easily demonstrated. 
Apophyllate of Ammonia.—When apophyllic acid is digested with ree 
and the solution evaporated, this salt is left in small prismatic crystals. Of this, 
a nitrogen determination gave a number too low for the formula of a neutral apo- 
phyllate, but approximating to it. 
Apophyllate of Baryta is obtained by digesting the acid with carbonate of 
baryta. It is highly soluble in water, and is precipitated by strong alcohol in wart- 
like crystals. 
Associated with apophyllic acid, another substance was obtained on one occa- 
sion in small quantity. It occurs in the form of yellow needle-shaped crystals, 
which have an acid reaction and are readily soluble in water. They fuse on the 
application of heat into a yellow fluid, which solidifies on cooling into a crystalline 
mass. Its analysis gave these results :— 
4-857 grains, dried at 212°, gave 
10-907 ... carbonic acid, and 


723 .... water. 
4-755 grains, dried at 212°, gave 
3155 ... _ platinochloride of ammonium. 
Experiment, Calculation. 
—_—_— 
Carbon, 3 H 61:24 60°85 C,, 216 
Hydrogen, . 9 3°94 3°66 H,, 13 
Nitrogen, . c 4:16 3°94 N 14 
Oxygen, . . 30°66 3155. 0,, 112 
100-00 100-00 355 
The formula approximating most nearly to these numbers is C,, H,, NO,, ; 
but I have been unable, from want of material, to confirm them by additional 
analyses or determinations of atomic weight. 
On another occasion, a substance was obtained which presented no marked 
differences from the last, but which contained 55°80 of carbon and 3:94 of hydro- 
_ gen. There was not a sufficient quantity for a nitrogen determination. These 
_ matters will require a further investigation, and I only refer to them here for the 
