ACTION OF THE HALOGENS^, ETC. 



163 



foreground whether, in these cases also, it could be shown that acids 

 could be added to the sulphur in the compounds. This was, as will 

 be shown, the case; and it seems that we have obtained here for the 

 first time compounds which contain in a ring two sulphur atoms 

 which show basic properties. The name "dithionium bases" might 

 well be given to this series of substances. In the light of what has 

 been said, the following ring — 



H 



I. I I 



C\S/C 

 H 



may be considered peculiar to them. They are therefore to be 

 looked upon as substitution products of an at present unknown sul- 

 phur analogue of hydrazine whose formula would be S^Hg. In this 

 four valences are satisfied by valences from four ring-bound carbon 

 atoms, while two hydrogen atoms remain in it intact. 



I. 



Hydrazine 



H H 



I 

 H H 



II. 

 Unknown 

 Sulphur 

 Analogue 



H 



I 

 H 



Phenazine can be regarded as a derivative of I, and thiochinan 

 threne as a derivative of II, 



Phenazine 



Thiochinanthrene 



