PHILOSOPHIC A L TR A NS ACTIONS 
OF THE 
ROYAL SOCIETY OF LONDON. 
Series A, Yol. 221. Pp. 239-264. 
HI?' ' 
TIDAL FRICTION IN SHALLOW SEAS. 
BY 
HAROLD JEFFREYS, M.A., D.Sc., 
FELLOW OF ST. JOHN’S COLLEGE, CAMBRIDGE. 
Printed and Published for the ROYAL SOCIETY by 
HARRISON AND SONS, Ltd., 44-47, ST. MARTIN’S LANE, LONDON, W.C. 2. 
printers tn c&rtfuiarji to 
1920. 
Price Three Shillings and Sixpence. 
