Ethy IJ ry ‘ thy li, , Nitrate. 197 
og 
sults in the following paper, Art. XX VII. The hydrous crystals 
ean be picked out before losing their luster if the atmosphere is 
damp, and the anhydrous crystals are easily distinguished after 
the former have become opaque. The following results were 
obtained on good monoclinic crystals which had been dried 
over oil of vitriol, and on transparent anhydrous crystals: 
Monoclinic Triclinic Calculated for 
dried crystals. crystals. C,H, .N;0;Ag. 
Carbon 18°55 18°62 18°75 
Hydrogen 4°08 4°12 3°91 
Nitrogen 16°58 16°64 16°41 
Silver 42°03 41°97 42°18 
Oxygen 18°75 
100°00 
Specific gravity, 2°13 2:28 
Melts with rapid 0 ° ° ° 
dsconepoaitibel wt t 190 dae sk ia 
To determine whether the monoclinic substance lost any 
ammonia on drying, nearly two grams of crystals, not entirely 
free from the triclinic body, were heated to 100°, in air which 
traversed a caustic potash drying tube before reaching the sub- 
. Stance and then passed a weighed tube filled with fragments of 
caustic potash. The substance lost in weight exactly what the 
latter tube gained, and the water thus estimated corresponded 
to 420 per cent. The following results were obtained by dry- 
ing well selected monoclinic crystals in a desiccator at 20° to 80°: 
0°383 gram lost 4°28 per cent. 
ce 4°26 oe 
0343 ; 
0°437 “ee (<4 4°23 ee 
1°0504 “ S. 4°34 a 
After the 0388 gram had obtained a constant weight in the 
desiccator it was exposed for half an hour to 60° without further 
loss; in three quarters of an hour at 100° the loss increased 
0:0025 gram and the crystals had become brown. These water 
determinations lead to the troublesome formula for the mono- 
oxide fumes. Both turn brown at 100°, the monoclinic crystals 
remain brittle, but the triclinic substance becomes gummy at 
