44 THE AMES FORESTER 



americana) and the burr oak (Quercus macrocarpa) . If these species 

 occur, the writer did not observe them. The author is quite sure that 

 the white ash (Fraxinus americana) does not occur in the region. 

 I am quite certain that the species barely extends into Minnesota. 

 Arthur, Holway and Bailey do not report this ash in the list of plants 

 between Lake Superior and the International Boundary. 



C. R. Van Hise and C. K. Leith who discuss the geology of the Lake 

 Superior region state that the lakes of the region are generally par- 

 allel to the trend of the ridges and generally longer than broad. 



'U. S. Geol. Survey LJI 1911:92 



