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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,
549 & 551 BROADWAY.
UGL 291-7397
3-14-85
tro to Buhr
2-9-98