[Aueusr, 1898. | 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
HOw Dili IN SOCIHT y. 
VOLUME VII.—(SERIES IL) 
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, F.B.S., 
anp HUGH RAMAGH, A.R.C.Sce.1. 
(Pirate I.) 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 
WILLIAMS AND NORGATHER, 
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. 
