Manchester Memoirs, Vol. Iviii. (1914), No. 10. 11 



II. Polyatomic molecules of elements may be repre- 

 sented by constitutional formulae in a way similar to the 

 molecules of compounds. 



In conclusion I wish to express my great indebted- 

 ness to Prof. H. B. Dixon, F.R.S., for his sympathetic 

 interest and kind criticism, and to Dr. H. F. Coward for 

 several suggestive discussions in connection with this 

 paper. 



Chemical Department, 



The University, Manchester, 



February, igi4. 



