THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Yol. XIII. (S.S.X lo. 21. MAT, 1913. 



ON THE VACUUM TUBE SPECTEA OF SOME 

 METALS AND METALLIC CHLORIDES. 



Part II.— LEAD, IRON, MANGANESE, NICKEL, 

 COBALT, CHROMIUM, BARIUM, CALCIUM, 

 STRONTIUM, MAGNESIUM, POTASSIUM, 

 SODIUM, AND LITHIUM. 



BY 



JAMES H. POLLOK, D.Sc, 



EOYAL COLLEGE OF SCIENCE FOE IRELAND. 



(PLATES XXII., XXIII.) 



[A ufhors alone are responsible for all opinions expressed in their Communications.] 



DUBLIN : 



PUBLISHED BY THE EOYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 



WILLIAMS AND NORGATE, 



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1912. 



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