PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF LONDON. 
Series A, Vol. 217. Pp. 199-235. 
MONOCLINIC DOUBLE SELENATES OF THE 
NICKEL CROUP. 
BY 
A. E. H. TUTTON, D.Sc., M.A., F.RS. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
printer^ in Ortttnary to iHajeStu. 
1917. 
A 554. 
Price Tv)o Shillings. 
26.6.17 
