38 SCIENCE PROGRESS 



Generalisations 



I. Polyatomic molecules combining with one another and 

 giving finally simple molecules must either disintegrate before 

 the reaction (under the influence of temperature, pressure, etc), 

 or form a complex or complexes, stable or unstable, as the case 

 may be. 



II. Polyatomic molecules of elements may be represented 

 by constitutional formulae in a manner similar to that adopted 

 in case of molecules of compounds. 



In conclusion, I wish to express my indebtedness to Mr. 

 R. Partington, M.Sc, for the help given in connection with the 

 collection of the physical data, and Mr. H. Stephen, M.Sc, for 

 the diagrams. 



