Revised by Dr. George D. Fuller, Professor Emeritus of Botany,
University of Chicago, Curator of Botany, Illinois State Museum, and
State Forester E. E. Nuuttila.
(_1st. ed., 1927, by Mattoon, W. R., and Miller, R. B._)
_Revised 1955_
DEPARTMENT OF CONSERVATION
DIVISION OF FORESTRY
SPRINGFIELD
WILLIAM T. LODGE,
Director
(Printed by Authority of the State of Illinois)