THE 
SCIENTIFIC PROCEEDINGS 
ROYAL DUBLIN SOCIETY. 
Nol era. S.); No. 20: AUGUST, 1907. 
NOTE ON THE SPECTRA OF CALCIUM AND 
MAGNESIUM AS OBSERVED UNDER 
DIFFERENT CONDITIONS, 
BY 
WALTER NOEL HARTLEY, D.Sc., F.R.S., 
ROYAL COLLEGE OF SCIENCE, DUBLIN. 
[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. 
1907. 
Price Sixpence. 
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