PHILOSOPHICAL TRANSACTIONS 
or THE 
ROYAL SOCIETY OF LONDON. 
Series A, VOL. 212. TITLE, &a 
TITLE, CONTENTS, INDEX, &c. 
A, VOL. 212 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HAERISON AND SONS, ST. MARTIN’S LANE. 
DULAU AND CO., LTD., 37, SOHO SQUARE, W. 
FRIEDLANDER AND SON, BERLIN. 
1913. 
A 496 
31 . 3.13 
Price Sixpence. 
