W. G. Mixter—Ethylidenamine Silver Sulphate. 427 
Art. LIV. — On Biigiolencansne Silver Sulphate ; by W. G. 
MIxTER. Contributions from the Sheffield Laboratory of 
Yale College, No. LVI. 
ALDEHYDE AMMONIA precipitates metallic silver from many 
of its salts almost as readily as from the nitrate. A mixture 
of solutions of silver sulphate and aldehyde ammonia produces 
a mirror when Way and at common Miwa aie te evapo- 
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left to spontaneous spratichlibion: few or no crystals of the ammo- 
nio sulphate form, but colorless transparent crystals separate, 
which react strongly for aldehyde. At summer temperatures 
tabular crystals, and at from 10° to 15° C. elongated crystals, 
predominate. 
he following analyses were made of carefully selected _ 
well-defined tabular crystals, which were from 2 to 5m™ 
diameter, and which were freed as much as possible from the 
mother liquor by blotting paper, then washed with alcohol 
and finally with ether. They were considered dry when they 
did-not lose weight on the balance in five or ten minutes. 
alculated Calcula 
Ag,80, (0st NED i IL. III. AS SO.(0,ILNF), 
8 661 6°68 NH; 
Ag 44-64 45555 > 4 2 4008 2 aT -I0 
C 19°83. 1813 74 15°90 59 1627 62 15°72 
H 4°13 4°62 4°14 4°31 3°95 
11°57 11°28 12-20 
* 
