On Compounds of Ethylene. 179 
sein for instance, that the ethionic acid, discovered by Mr. 
agnus, may be such a compound, namely, ethylene-sulphuro-sul- 
phurous acid. : 
H ) wo FH ) $206 
Disulphetholic acid CaHa +?"  Ethionie acid CaHa 
HL ) 8206 H }) 820s 
The following table contains some of the known ethylene and 
succinyl] compounds compared with the corresponding derivatives 
of the ethyl and propiony] series. ' 
Compounds of the Alcohol-forming Radicals. 
Ethyl Series. Ethylene Series. 
Ethyl, aA } Ethylene, CuHs 
Chlorid of ethyl, CaHCl Chlorid of Ethylene, CsHaCls 
Sulphid of Ethyl,  G* 8 Se Sulphid of Ethylene, CuHSs 
Cs 
Mercaptan, ar } S2 Sulphocyanid of nT eA a 
Sulphoeyanid of Ethyl gros Ethylene-mercaptan, Cults ae 
y4; Cy y Pi H S2 
Bisulphid of Ethyl, CuHsS2 Bisulphid of Ethylene,  CsHSs 
H } 
Ethylsulphurous acid, 1H ; S206 Ethylene sulphurous acid,Cs - a 
H 
Ethylene sulphuro sul- S206 
Eh ours ae a es ae eT : 
phurous acid, we S208 
Sulphovinic acid, ym } S20s 
Compounds of the Acid-forming Radicals. 
: Propiony] Series. Succiny! Series. 
Chlorid of propionyl, C2(CsHs)02C1 Chlorid of succinyl, Ca(CsHs)O«Cla 
4 aa 0: 
Propionic acid, oe Os Sueccinic acid, sea) s 6s 
Ydrous pro- Ca(CuHs)O2 Anhydrous succinic 
nbyds : 
Plonic acid, On Cattayos } = acid, Pg: Oz 
H ze 
Propionyl amid, N H Succinamid, Oa(CaHs)Os 
C2(CsHs)O2 a 
