192 



THE ROYAL SOCIETY OF CANADA 



Lehmann, for it will be remembered that by it the lines were recorded 

 by their inverting action on a phosphorescent screen. It is quite 

 possible that the line 1-015/i being nearer to the wave-lengths of the 



1.50 

 WAVE. LtnCTtt m^. 



Fig. 9. 



visible spectrum than any of the others recorded, would not have as 

 strong an effect as waves of longer length. As regards the relative 

 intensities of the lines 1-014/z and 5461 A°U., it was noted by 



WAVE LttlGTM ln>l 



Fig. 10. 



