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BY
W. J. BEAL, M.S., PH.D.
PROFESSOR OF BOTANY AND FORESTRY IN
MICHIGAN AGRICULTURAL COLLEGE
GINN & COMPANY
BOSTON · NEW YORK · CHICAGO · LONDON
COPYRIGHT, 1898
BY WILLIAM J. BEAL
ALL RIGHTS RESERVED
36.11
The Athenæum Press
GINN & COMPANY · PROPRIETORS · BOSTON · U.S.A.