the Illinois River, H. J. Van Cleave 151 



Keys for the Separation of the Bremidae, or Bumblebees of 



Illinois, and other Notes, Theodore H. Frison 157 



Bird Songs, Anne Wakely Jackson 166 



Ecological Committee Report on Forestry Survey 181 



The Forest Lands of Jo Daviess County, H. S. Pepoon 183 



A Preliminary Report on the North Two Tiers of Sections 



in Niles Township, Cook County, Illinois, Warren G. 



Waterman 203 



Ecological Survey of Forests in the Vicinity of Glencoe, 



Illinois, Hazel M. Schmoll 208 



Preliminary Account of the Forests in Cumberland County, - 



Illinois, Arthur G. Vestal 234 



The Forests of La Salle County, Illinois, Geo. D. Fuller and 



P. D. Strausbaugh 246 



Strip Survey and Growth Studies in La Salle County, R. B. 



Miller and Geo. D. Fuller 273 



The Forests of Vermilion County, W. B. McDougall 282 



Constitution and By-Laws 290 



List of Members 293 



