THE 
SCIENTIFIC PROCEEDINGS 
OF THE 
ROYAL DUBLIN SOCIETY. 
Vol. XI. (N.8.), No. 31. FEBRUARY, 1909. 
ON THE QUANTITATIVE SPARK-SPECTRA OF 
TITANIUM, URANIUM, AND VANADIUM. 
BY 
TiS He POLLOK,, D.Sc: 
ROYAL COLLEGE OF SCIENCE, DUBLIN. 
(PLATES XXV., XXVI.) 
[Authors alone are responsible for all opinions expressed in their Communications. | 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 
LEINSTER HOUSE, DUBLIN. 
WILLIAMS AND NORGATE, 
14, HENRIETTA-STREET, COVENT GARDEN, LONDON, W.C. 
1909. 
2 "Yo, 
Gp \ 
Price Sixpence. ( OCT 4 191) 2 
iy /Ona| Museve “l 
