PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF LONDON. 
Series A, Vol. 214. Pp. 225-266. 
[Plate 3.] 
BAKERIAI LECTURE 
SERIES LINES IN SPARK SPECTRA. 
BY 
A. FOWLER, F.R.S., 
ASSISTANT PROFESSOR OF PHYSICS, IMPERIAL COLLEGE, SOUTH KENSINGTON. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HARRISON AND SONS, ST. MARTIN’S LANE. 
DULAU AND CO., LTD., 37, SOHO SQUARE, W. 
FRIEDLANDER AND SON, BERLIN. 
1914. 
514 . 
18.7.14 
Price Two Shillings and Sixpence. 
