i [Aveusr, 1898. | 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
nO MWinEIN SOCINTY. 
VOLUME VII—(SERIES II) 
I. 
A DETERMINATION OF THE WAVE-LENGTHS OF THE PRINCIPAL LINES 
IN THE SPECTRUM OF GALLIUM, SHOWING THEIR IDENTITY WITH 
TWO LINES IN THE SOLAR SPECTRUM. By W. N. HARTLEY, E.RBS., 
anp HUGH RAMAGEH, A.R.C.S8c.I. 
(Piate I.) 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 
WILLIAMS AND NORGATE, 
14, HENRIETTA STREET, COVENT GARDEN, LONDON: 
20, SOUTH FREDERICK STREET, EDINBURGH; anv 7, BROAD STREET, OXFORD. 
PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND WELDRICK, 
1898. 
Price One Shilling. 
