THK 
SCIENTIFIC PROCEEDINGS 
OF THE 
ROYAL DUBLIN SOCIETY. 
Vol. XI. (N.8.), No. 17. JULY, 1907. 
ON THE QUANTITATIVE SPECTRA OF TRON, 
ALUMINIUM, CHROMIUM, SILICON, ZINC, 
MANGANESE, NICKEL, AND COBALT. 
bY 
JAMES H. POLLOK, D.Sc., 
AND 
A. G. G. LEONARD, AGRSE'S.I. 
(PLATES XII.-XVII.) 
[Authors alone are responsible for all opinions expressed in their Communications. | 
DOG TAIN 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 
LEINSTER HOUSE, DUBLIN. 
WILLIAMS AND NORGATE, 
14, HENRIETTA-STREET, COVENT GARDEN, LONDON, W.C. 
1907. 
Price One Shilling. 
