LETTER OF TRANSMITTAL. 
To Hon. Woodbriclge A 7 . Ferris } Governor of the State of Michigan: 
Sir — I have the honor to submit herewith the Fifteenth Annual Report 
of the Michigan Academy of Science for publication, in accordance with 
Section 14 of Act No. 44 of the Public Acts of the Legislature of 1899. 
Respectfully, 
Richard de Zeeuw, 
Secretary. 
East Lansing. Michigan, May, 1913. 
