PROCEEDINGS 



OF THE 



CAMBEIDGE PHILOSOPHICAL 

 SOCIETY 



VOLUME XIX 



30 October 1916—24 November 1919 



CAMBRIDGE 



AT THE UNIVERSITY PRESS 



AND SOLD BY 



DEIGHTON, BELL & CO. AND BOWES & BOWES, CAMBRIDGE 



CAMBRIDGE UNIVERSITY PRESS 

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



1920 



