PHILOSOPHICAL TRANSACTIONS 
OF THE 
KOYAL SOCIETY OF LONDON 
Series A, VOL. 201, pp. 205-222. 
[Plate 1.] 
THE SPECTRUM OP y CYGNI 
BY 
Sir NORMAN LOCKYER, K.C.B., F.R.S., 
AND 
F. E. BAXANDALL, A.R.C.Sc. 
LONDON: 
PUBLISHED FOR THE ROYAL SOCIETY 
BY DULAU AND CO., 37, SOHO SQUARE, W. 
CONTINENTAL AGENTS, MESSRS. FRIEDLANDER AND SON, BERLIN. 
1903. 
Price Ttvo Shillings and Sixpence. 
A 337. 
19,6,03 
