14 J. M. Crafts on Ethers of Arsenic Acid. 
Arseniate of ethyl is immediately decomposed by ammonia 
with the formation of a crystalline body, which it is very difficult 
to obtain pure on account of the extreme avidity with which it 
absorbs moisture. The results of several analyses lead to the 
conclusion, that the body which is first formed has the compo- 
sition: (C HH. ).NH, AsO,, and that it absorbs water to form a 
di-ethyl arseniate of ammonium, (C,H,),NH,AsO,, but the 
study of this product is not yet completed. 
ARSENIATE OF METHYL. 
The arseniate of methyl can be prepared from the iodid of 
methyl and arseniate of silver in the same way that the arseniate 
of ethyl is prepared. The crude product is purified by distilla- 
tion under a pressure of sixty millimeters. At this pressure it 
distils without decomposition at 128°-130°. 
x erage ‘4500 grms. ; CO,=0°3285 grms. ; H,O=071980 
aa pe 0°8070 grms. ; As,0;=0 ‘4966 grms. 
The determination of arsenic was made by decomposing the 
ether with water, evaporating with nitric acid, and heating the 
arsenic acid thus formed with oxyd of lead. 
Calculated for (CH3)gAs04. 
19°57 
H = 491 aii 4°89 
40°76 
The density of liquid of ena of aoe at 14°5, com- 
pared with water at 4°, =1-5591 
en pure arseniate of methyl is distilled in the air, the 
greater part passes at 213°-215°, bai there is a partial decom- 
position with separation of arsenic aci 
It resembles the arseniate of ethyl in ‘all its properties. It is 
a colorless liquid, miscible in all proportions with water, and it 
is decom immediately into arsenic acid and alcohol by 
the action of water or moisture for the air 
ARSENIATE OF AMYL. 
a oy is produced by action of iodid of amyl on the 
of silver, but it cannot be obtained in a state of 
y Bette bocanee it decomposes oses, even when distilled in vacuo. 
ae product of the reaction, after having been heated 
to 170°, was mixed with os ether, when a considerable 
quantity of arsenious acid was precipitated ; after filteri Tose 3 
os was: origeee in an oil- hath, and finally a current 0 a 
ssed through it, while the bath was kept at * 
an onalvae of the product so obtained gave C=39°31 per cent 
and H=7°64— pli cent, instead of C=5114 per cent and 
H=9°37 per cen Zs 
