of Edinburgh , Session 1880 - 81 . 
243 
From these results it is manifest that the amorphous precipitate 
produced in solution of amnionic comenate, as likewise the crystal- 
line salt above described, are the monobasic silver salt. The only 
product that approximates in composition to di-argentic comenate is 
the precipitate produced in the alkaline solution of comenate of 
ammonia. From experiment (6) it is evident that when argentic 
comenate is boiled with water, the silver is reduced to the metallic 
state ; reduction taking place much more readily than with the 
corresponding meconate. 
Copper Salt. 
This was prepared by adding excess of cupric sulphate to a hot 
solution of ammonic comenate. A crystalline precipitate separated 
immediately, increasing in quantity as the solution cooled. The 
crystals dried at 120° were ignited, the residue dissolved in hot 
nitric acid, and caustic soda solution added to the boiling nitrate of 
copper. The precipitated oxide was washed by boiling with water, 
then on the filter with hot water, and finally ignited. 8*615 grs. 
gave 2*910 grs. CuO = 33*77 per cent. C 6 H 2 Cu0 5 H 2 0, is = 33*73 
OuO per cent. 
Calcium Salts. 
(1.) Prepared by adding solution of calcic chloride to warm solu- 
tion of ammonic comenate. The salt so obtained was recrystallised 
from boiling water, and after drying in the air, exposed to heat of 
air-bath at 120°. 
9*870 grs. lost 2*515 grs. = 25*48 per cent. 
The dried substance was ignited, converted into sulphate, and 
again ignited. It gave 2*81 grs. CaS0 4 = 0*826 grs. Ca = 8*36 per 
cent. 
(C 6 H 3 0 5 ) 2 Ca7H 2 0 would yield 26*47 H 2 0, and 8*40 Ca 
per cent. 
(2.) A strong solution of ammonium comenate was rendered 
alkaline by addition of ammonia, and poured into saturated solution 
of calcic chloride. An indistinctly crystalline precipitate separated. 
When dried at 120° C. 
11*26 grs. gave 7*24 grs. CaS0 4 = 2*98 CaO =26*45 per cent. 
12*28 grs. gave 7*40 grs. CaS0 4 = 3*047 CaO = 26*42 „ 
