194 



or compounds of the oxygen-group. It is probable, for instance, 

 that the ethionic acid, discovered by M. Magnus, may be such a 

 compound, namely ethylene-sulphuro-sulphurous acid. 



H Un H "Un 



Disulphetholic n tr j * Ethionic TT / ^ Ug 

 acid. C4H acid ' 4 4 



The following Table contains some of the known ethylene and 

 succinyl compounds compared with the corresponding derivatives of 

 the ethyl and propionyl series. 



Compounds of the Alcohol-forming Radicals. 

 Ethyl-series. Ethylene-series. 



Ethyl ........ ^Hsj Ethylene .......... C 4 H 4 



Chloride of ethyl C 4 H^ Cl Chloride of ethylene. . C 4 H 4 C1 2 

 Sulphide of ethyl 4 g 5 1 S 2 Sulphide of ethylene. . C 4 H 4 S 2 



H j^ 

 Mercaptan .... C 4 5 S 2 Ethylene-mercaptan . . C 4 H 4 



Sulphocyanide of C 4 H 5 1 g Sulphocyanide of ethy- Q jj J s 

 ethyl. Cy J 2 lene. 4 4 1 g 



i s ul P hide of ethylene C 4 H 4 S 4 



e thl 4 5 a 4 4 4 



H Is o 



Ethylsulphurous C 4 H. "1 c Ethylene- sulphurous r J 2 6 

 acid". 4 H 5 ) S A acid. 4 4 1 S O 







H 



H s o 



Ethylene-sulphuro-sul- Q jj J 5 

 phurousacid. 44 



Sulphovinic acid *^g* J S 2 O 8 



Compounds of the Acid-forming Radicals. 



Propionyl-series. Succinyl-series. 



CWcrideofpro- C!(C4Hs)0!jC1 Chloride of sue- c^H^.CL, 



