108 Proceedings of the Royal Irish Academy. 



what analagous to the Tvell-known beazine ring of the aromatic car- 

 hon compounds. Thus : — 



Co 



/ \ 

 



/ \ 



C03O5 = Co— 0— Co = Co"0, 2 Co'^0, 



W 11 











II II 



Co— 0— Co— 0— Co 



/ \ 







/ \ 



Co Co = 



/ \ 







= Co Co 



Coio0i9= O =5Co'0, 7Co Oo 



/ 

 Co Co =: 



\ / 







\ / 



Co-0-Co-0_Co 

 II II 







This investigation was conducted in the Chemical Laboratory of 

 the Eoyal College of Science, Ireland. 



