PKOCEEDINGS 



OF THE 



CAMBRIDGE PHILOSOPHICAL 

 SOCIETY 



VOL. XIX. PART IV. 



[Michaelmas Term 1917— Easter Term 1918.] 



(iDambtitrgc : 

 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.G. 4 



1918 

 Price Two Shillings and Sixpence Net 



July 1918. 



