LETTER OF TRANSMITTAL. 



To the Honorable the Board of Geological Survey of the State of Mich- 

 igan : 



Gov. Fred M. Warner, President. 

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

 Hon. L. L. Wright, Secretai-y. 



Gentlemen : — I beg to present herewith for printing, a report by l^r. 

 Chas. 0. Adams on the ecology, that is the natural history, of Isle Eoyale. 

 This comes to us with the apjjroval of Dr. A. G. Ruthven, our Chief Field 

 Naturalist, and our Board of Scientific Advisers, and is a continuation 

 of the work published in our annual report for 1905. 



This contribution to the Biological Survey of the State, which the 

 legislature authorized me to supervise by Act No. 250 of the session of 

 1005, comes from the University Museum. The explorations Avere made 

 without expense to the State Survey by means of contributions from 

 friends of the Museum. As this work is in harmony with the aims of 

 the Biological Survey we are fortunate in securing such co-operation. 

 The reports on the Porcupine Mountains and Isle Royale at the north 

 end of the state complement the work on Walnut Lake, Oakland county, 

 and that iti Huron and Tuscola counties. 



I trust that the present report will be of service to the schools of the 

 state. 



Very respectful! v, 



ALFRED C. LANE, 



State Geologist. 



