242 Proceedings of the Royal Society 
comenate rendered alkaline by ammonia, the precipitate being dried 
at 120° C. 
8*01 grs. gave by ignition 4*60 grs. Ag = 57*42 per cent. 
Of another quantity, prepared in the same way, 8 *8 6 grs. give 
5*02 grs. Ag= 76*65 per cent. 
(4.) Aqueous solutions of argentic nitrate and ammonic comenate 
were mixed, the precipitate produced being washed by decantation. 
The beaker containing the same was then covered and placed in the 
dark. After a few days crystals had appeared, and these gradually 
increased in number until the whole of the original amorphous 
precipitate had disappeared. These crystals were removed from the 
beaker and dried on blotting paper and by exposure to the air. 
They have the form of hexagonal prisms, and are of a brown 
colour. The weight was not altered by exposure to a temperature 
of 100° C. 
14*21 grs. gave by ignition 5*43 Ag = 38*21 per cent. 
(5.) The amorphous precipitate above mentioned was boiled with 
water for several hours, and then filtered. On cooling the filtrate 
deposited small white crystals, which under the microscope presented 
the appearance of flat four-sided prisms. These crystals after 
drying in the air at the ordinary temperature lost no weight at 
120° C. 
6*07 grs. gave 2*32 grs. Ag = 38*22 per cent. 
Another portion, exposed to temperature of 160° C. until it had 
almost ceased to lose weight, became darker in colour as if slightly 
decomposed. 
10*15 grs. gave 4*175 grs. Ag = 41*13 per cent. 
(6.) A quantity of the amorphous silver comenate was boiled 
with water for thirty hours, the residue collected on filter, washed 
with hot water, and dried in water-bath. 
8*03 grs. gave 7*95 grs. Ag = 99*00 per cent. 
C 6 H 3 Ag0 5 H 2 0 = 38*43 Ag per cent. 
C 6 H 3 Ag0 5 =41-06 Ag „ 
C 6 H 2 A S2 0 5 H 2° =55.67 Ag 
C 6 H 2 Ag 2 0 6 = 58-37 Ag 
J? 
