232 



Table X.— Growth of Swamp Spanish Oak. (Q. pagodaefolia), Illinois. 

 Time required to grow to a specified diameter breasthigh. 



Table XI. — Growth of Pin Oak (Q. palustris), Illinois. 



(1) Based on decade measurements on 144 stumps, averaging 1.9 feet high. 



(2) Based on sectional age counts on 20 trees. 



