W. G. Mixter—Ethylidenamine Silver Sulphate. 429 
had become opaque white on edge, were dried to a constant 
weight for the water determination, and then used to find the 
sulphur content. The 17-67 per cent of water in VII was from 
drying 2°37 grams of crystals which had also become opaque 
while on edges. 
Analysis VI corresponds with the theory, and the anhy- 
drous material used in VII was from the same kind of crystals. 
The deficiency in the amount of carbon found may be ascribed 
either to impurities or a slight decomposition. I after losing 
water of crystallization, has essentially the same composition as 
VII. BothIand VI are hydrates of a compound analogous 
to ammonio silver sulphate, thus, 
Ag,SO,(NH 
Ae Sot tCH CH—NH),. 3H,0 
Ag,SO,(CH,CH=NH),, 6H,O 
The name ethylidenamine silver sulphate is proposed for the 
resent. 
Analysis IV was made with hydrous crystals, and II with 
anhydrous substance from the same crop of crystals which were 
apparently of the same form as the crystals which gave results L 
If and IV, give the formula, 
Ag,SO,(CH,CH=NH),NH,, 3H,0. 
Leaving out the 3H,O we see that the substance has the same 
composition as a mixture of 3 molecules of Ag,SO,(C,H,N1 
and one molecule Ag,SO,(NH,),. But if we suppose it a 
mixture of Ag,SO,(C,H,NH),, 8H,O and Ag,SO,(NH,), 
we find that the water is 8:1 per cent and does not accord with 
_ the water found, and the conclusion is that the substance anal- 
yzed was not a mixture, but a compound containing three 
ethyliden groups, and answering to the formula already given. 
III and V of two different crops of crystals appear to be mix- 
tures of Ag,SO,(C,H,NH),, 3H,O and Ag,SO,(C,H,NH), 
NH,, 3H,O. Ethylidenamine silver sulphate is soluble in 
water and yields aldehyde when treated with acids. The hex- 
Find ay salt loses water more readily in dry air than the trihy- 
rated. 
