233 

 Table XII. — Growth of White or American Elm (Ulmus Americana), Illinois. 



Based on decade measurements on 29 stumps, averaging 2.1 feet high, ranging 

 from 25 to 228 years in age. Measured near Hardin, Calhoun County, Illinois. 



Table XIII. — Growth of Oaks and Basswood on Prairie Upland, Illinois. 



Based on decade measurements on the stumps of 62 white oaks, 14 black oaks, 

 and 6 basswoods. Measured in northern and central Illinois by E. A. Ziegler. 



main purpose of this investigation. Logging methods in Illinois make 

 it very hard to get measurements of enough trees in one locality within 

 a reasonable length of time. The figures given are intended to be used 

 only in rough determinations, but they are of some value, as they are 

 probably the only figures on the growth of pin and swamp Spanish 

 oaks, and the only data on white elm in the Middle West. 



