INTRODUCTION. 15 



It has been found impossible to work up all of this material in the 

 present report, which will, therefore, have to be supplemented from 

 time to time as the remaining data is organized. 



In carrying on this investigation the Sm'vey became indebted to a 

 number of persons for very material assistance. The camps on Sand 

 Point and Stony Island were secured from Messrs. W. H. Wallace and 

 W. J. Orr of Saginaw, and Mr. George Clark, Bad Axe, Michigan, kindly 

 provided the camp used for a time at Rush Lake. The assistance re- 

 ceived in the identification of material is acknowledged in the different 

 papers. 



The writer wishes to acknowledge his personal indebtedness to Prof. 

 Jacob Reighard, University of Michigan, and to Mr. Bryant Walker, 

 Detroit, for many helpful suggestions and much material assistance. 



