PHILOSOPHICAL TEANSACTIONS 
OP THE 
ROYAL SOCIETY OE LONDON 
Series A, VOL. 202, pp. 459-523. 
[Plate 13.] 
AN ENQUIRY INTO THE VARIATION OP ANGLES OBSERVED 
IN CRYSTALS; ESPECIALLY OP POTASSIUM- 
ALUM AND AMMONIUM-ALUM. 
BY 
HENRY A. MIERS, D.So., M.A., F.R.S., V.P.G.S., V.P.C.8. 
WAYNPLETE PROFESSOR OP MINERALOGY IN THE UNIVERSITY 
OP OXFORD. 
LONDON: 
published FOR THE ROYAL SOCIETY 
BY DULAU AND CO., 37, SOHO SQUARE, W. 
CONTINENTAL AGENTS, MESSRS. FRIEDLANDER AND SON, BERLIN. 
1903. 
A 356. 
Price Three Shillings and Sixpence. 
15.12.03 
