PROCEEDINGS 



AND 



TRANSACTIONS 



OF 



THE ROYAL SOCIETY 



OF 



CANADA 



THIRD SERIES— VOLUME XV 



MEETING OF MAY, 1921 



VOR SALE BY 



[AS. HOPE & SON, OTTAWA; THE COPP-CLARK CO. (Limited), TORONTO 



BERNARD QUARITCH, LONDON, ENGLAND 



1921 



