PEOCEBDINGS 



OF THE 



CAMBKIDGE PHILOSOPHICAL 

 SOCIETY. 



VOLUME XIII. 

 October 31, 1904— May 14, 1906. 



(JDambrfoge : 



AT THE UNIVERSITY PRESS, 



AND SOLD BY 



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



CAMBRIDGE UNIVERSITY PRESS WAREHOUSE, 

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



1906 



