PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF LONDON. 
Series A, Vol. 216. Pp. 1-62. 
THE MONOCLINIC DOUBLE SULPHATES 
CONTAINING- AMMONIUM. 
COMPLETION OF THE DOUBLE SULPHATE SERIES. 
A. E. H. TUTTON, D.Sc., M.A., F.R.S., 
PRESIDENT OF THE MINERALOGICAL SOCIETY. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
Printer^ tn ©rtftnarg to iHajes'tn. 
1915. 
A 538. 
Price Three Shillings. 
30.10.15 
