78 THE ROYAL SOCIETY OF CANADA 



for the spark spectra of these metals by previous observers. For tin, 

 lead and thallium, Saunders has given measurements between about 

 A2400 and >^1800, which correspond fairly well with these results. 

 Several new lines have been observed and measured between A1800 

 and A1400. For the arc spectra of iron, cobalt, nickel and carbon, 

 several lines were obtained, and measured, some of which corresponded 

 with results given in previous work. 



This work was begun by Mr. Ainslie under the direction of 

 Professor J. C. McLennan and continued by the joint authors under 

 the direction of Professor E. F. Burton. 



