INTRODUCTORY NOTE. 



Tlirough the generosity of ^Nlr. Bryant Walker, of Detroit, Hon. Peter 

 White* and ilr. H. M. Kanfman of Marquette, the University Museum of 

 the University of Michigan was able, in the summer of 1904, to send a 

 party to the Porcupine ^Mountains and to Isle Royale, Michigan. The 

 aim of the party -was to collect specimens for the museum and to make an 

 ecological suiTey of the regions visited. The party was only able to 

 sjjend a few weeks on Jsle Royale at that time, but through the continued 

 generosity of ^Mr. White and Mr. AValker, the survey was continued dur- 

 ing the summer of 1905. The present volume on the natural history of 

 the island ha.s resulted from these surveys. 



To Ml-. White and Mr. Walker the Museum is under special obligations 

 for their hearty and substantial support, not only in the funds provided, 

 but also for their aid in securing the transportation of the par-ty. Many 

 other individuals also ai-sisted in various ways. Those who aided the 

 party in the matter of transportation were: Mr. Henry Russel, of the 

 Michigan Central Railway; ilr. Geo. T. Arnold, of the Union Ticket 

 Office and Dock of Mackinac Island; Mr. H. H. Brigham, of the U. S. 

 and Dominion Transportation Company ("Booth Line") ; Mr. Henry 

 Meyering, of the Graham and Morton Line; Mr. M. Adson, of the Duluth, 

 South Shore and Atlantic Railway. The suiwey is furthermore indebted 

 to Section Director C. F. Schneider of the Michigan Section of the Clim- 

 atological Service of the U. S. Weather Bureau, for the loan of meteoro- 

 logical instruments ; to Major Lansing H. Beach, Detroit, of the Light 

 House Establishment, for permission and suggestions as to camping in 

 the abandoned Light-house at Rock Harbor; to Mr. Geo. C. Stone, Sec- 

 retary of the Washington Club of Duluth, Minn., for the use of their 

 grounds and many favors from their care-takers, Mr. Chas. Preulx and 

 Mr. Michael HoUinger; to Mr. K. Neutson, of Park Place ("Neutson's 

 Resort"), Rock Harbor, Isle Royale, for many favors during the stay 

 upon the island; to Mr. J. H. Malone, Keeper of the Isle Royale Light, 

 and to his sons, particularly to the Assistant Keeper, Mr. J. A. Malone, 

 for many favors and for their hospitality. It is a pleasure to have this 

 opportunity of thanking these persons for their cooperation. 



On the return of the party from the field, work was at once begun upon 

 the collections, and in this a large number of specialists have aided by 

 the determination of the specimens. Acknowledgements are made to 

 such persons throughout the report and will not be repeated here. Those 

 who were not members of the party, but who have prepared papers are: 

 Mr. Bryant Walker, of Detroit, Michigan, Dr. W. M. Wheeler, American 

 Museum of Natural History ; Mr. A. P. Morse, Research Assistant of the 

 Carnegie .Institution, and Wellesley College; Dr. Jas. G. Needham, Cor- 



,* Recently deceased. 



