LETTERS OF TRANSMITTAL. 



To the Honorable the Board of Geological and Biological Survey of the 

 State of Michigan: 



Governor Chase S. Osborn, President. 

 Hon. D. M. Ferry, Jr., Vice President. 

 Hon. L. L. Wright, Secretary. 



Gentlemen: — I have the honor to present herewith as a part of the 

 report for 1910 of the Board of Geological and Biological Survey, 

 Publication No. 4, being a contribution to the biological survey of the 

 state authorized by Act No. 250 of the Session of 1905. 



Very respectfully, 



R. C. ALLEN, 



Director. 



Ann Arbor, Mich., January 11, 1911. 



Sir — I submit herewith a report upon the biological survey of the sand 

 dune region on the south shore of Saginaw Bay, Michigan, carried on 

 under my supervision during the summer of 1908. The report aims to 

 give a comprehensive account of the natural history of the region, and 

 to furnish data for the work of students and those interested in the 

 preservation of our native fauna and flora, or in the introduction of 

 animals and plants into the state. 



Respectfully, 

 ALEXANDER G. RUTHVEN, 



Chief Field Naturalist. 

 R. C. ALLEN, Director, 



Geological and Biological Survey, 

 Lansing, Michigan. 



