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This is an authorized facsimile
printed by microfilm/xerography on acid-free paper
in 1985 by
UNIVERSITY MICROFILMS INTERNATIONAL
Ann Arbor, Michigan, U.S.A.
ASA GRAY,
FISHER PROFESSOR OF NATURAL HISTORY (BOTANT) IN
HARVARD UNIVERSITY.
NEW YORK:
D. APPLETON AND COMPANY,
540 & 551 BROADWAY.
Grad UGL
QH
367
.G77
1877a Behr