MICHIGAN ACADEMY OF SCIENCE. 



43 



periods of greater water temperature and radiation is doubtless the greater factor in this 

 question. 



The following tables are appended showing the maximum and minimum temperatures 

 of West Saginaw, Bay City and Midland as furnished liy C. F. Schneider of the State 

 "Weather Bureau, with our own observations near Tobico. 



Geological Survey, Lansing, Michigan, March 20, 1905. 



