FIFTEENTH REPORT 
THE MICHIGAN ACAIIEMY OF SCIENCE 
CONTAINING AN ACCOUNT OF THE ANNUAL MEETING 
HELD AT 
ANN ARBOR, APRIL 2, 3 AND 4, 1913. 
PREPARED UNDER THE DIRECTION OF THE 
COUNCIL 
BY 
RICHARD DEZEEUW 
SECRETARY 
BY AUTHORITY 
LANSTNG, MICHIGAN 
WYNKOOP HAL LE N B EC’ K CRAWFORD CO., STATE PRINTERS 
1913 
