Chemistry and Physics. 257 
C,€u, C,€uH C,AgH 
NH, 4H,-H C,€u,.H or C,€uH.€u C, ,Ag,H 
NH,O vive’ C, €u,HO or C, Gul. €u0 Cy ,4g,HO 
The author further poe that (C.€ uH. se and (C,AgH.Ag)O 
are analogous to the f Reiset’s ‘base, (NH, Pt)O, and that various 
facts lead him to beliave: che there are compounds analogous to the base 
(2NH,Pt)O, such as [(C, AgH),Ag]O. 
n a subsequent paper the author describ il sae unds contain- 
- Ing gold and chromium, the constitution of which, however, is not yet 
clearly ascertained. Silver unites with allylene to (i argentallyl, the 
chlorid of which has the formula [C,H,Ag(C,H,Ag,)]Cl, so that the 
“neta corresponds to the secon series of acetylene compounds above 
entioned. Wh i i 
forms ethylene, C,H,, and its ere; C,H,. Potassium acts in a 
similar manner but with more violence. Ata a higher temperature paren 
replaces all the hydrogen and form C,Na,. The results given are to be 
considered as preliminary to a fuller investigation of oe subjec pine 
letin de la Société Chim ee March, 1866, pp. 176, 1 
5. Lsomerism.—BERTHELOT, in a Memoir on a new kind of isomerism, 
proposes the following subdivision of this subject. Isomeric bodies—th t 
is to say, bodies formed of the same elements united in the same propor- 
Hona—“can be separated into a certain number of classes or general 
groups 
(1) Rouiselent he serge —Substaneces which appear to have a 
purely accidental relation to nage other; for instance, butyric acid 
eH, 0, ks Pees (C,H 
@. Meta m.—Bodies fo ao by the union of 4 canbe de 
ciples, so Hat in thee formule a kind of compensation 
for example, methylacetic ether, C, H, (Cy H, O,) sad err etrarer 
ether, C, H, (C, H, O,). 
(3.) Polymerism. ~—Gompounds arising from the union of several aes 
ecules to form a this is shown in the case of vs sa “Eps gue 
ay ln Cro 
sire rr the compound molecule taken as a oe ee than the diver- 
poses bret a new one, called kenomeri (from xevdr), distinct 
from all the others, though allied to meta 
(6.) Kenomerism.—Two different compounds may lose, by the effect 
of certain reagents which bring about decomposition, different groups of 
elements, and the somaninders: 1 be identical 3 in composition ; these two de 2 
