PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OE LONDON. 
Series A, VOL. 212, pp. 117-148. 
PHYSICO-CHEMICAL DETERMINATIONS AT HIGH PRESSURES 
BY OPTICAL METHODS 
(RESEAKCH EXECUTED IX THE DAVY FARADAY RESEARCH LABORATORY OF 
THE ROYAL INSTITUTION OF ORE AT BRITAIN, LONDON, W.). 
BY 
WALTER WAHL, Ph.D., 
ROSENBERG RESEARCH FELLOW OF THE UNIVERSITY OF HELSINGFORS, 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HAEEISON AND SONS, ST. MAETIN’S LANE. 
DULAU AND CO.. LTD., 37, SOHO SQUAEE, W. 
FEIEDLANDEE AND SON, BEELIN. 
1912. 
A 487. 
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