14, 
167 Hee 4 Up, 
PROCEEDINGS ° 
CAMBRIDGE PHILOSOPHICAL 
SOCIETY. 
VOL. VI. --PART IU. 
(MicHaELMAS TERM, 1887.| 
Cambridge : 
PRINTED AT THE UNIVERSITY PRESS, 
AND SOLD BY 
DEIGHTON, BELL AND CO, AND MACMILLAN AND CO. CAMBRIDGE, 
G. BELL AND SONS, LONDON. 
1888 
