PROCEEDINGS 



OF THE 



CAMBRIDGE PHILOSOPHICAL 

 SOCIETY 



VOL. XIX. PARTS IL, III. 



[Lent and Easter Terms 1917.] 



AT THE UNIVERSITY PRESS 

 AND SOLD BY 

 DEIGHTON, BELL & CO., LIMITED, 

 AND BOWES & BOWES, CAMBRIDGE. 



CAMBRIDGE UNIVERSITY PRESS, 

 C. F. CLAY, MANAGER, FETTER LANE, LONDON, E.C. 4 



1917 

 Frice Two Shillings and Sixpence Net 



October 1917. 



