14 



THE ROYAL SOCIETY OF CANADA 



(3) In the ultraviolet part of the spectrum four broad bands were 

 found both with liquid and also gaseous oxygen, each made up of a 

 set of finer triplet bands. The wave-lengths of these bands w^ere 

 measured and those in the gaseous spectrum were found to be slightly 

 shifted towards the ultraviolet. 



(4) Some experiments were performed on the absorption spectra 

 of nitrogen and ozone which were the two most likely impurities 

 present in the oxygen. From the results obtained it was concluded 

 that the bands observed in the absorption spectrum of both liquid 

 and gaseous oxygen were due to oxygen and not to the presence of 

 the impurities mentioned above. 



This work was carried out under the direction of Prof. J. C. 

 McLennan to whom the writer wishes to express his most sincere 

 thanks for his advice and many practical suggestions. 



The Physical Laboratory, 

 University of Toronto, 

 May 15th, 192L 



F/c/ . /. 



