THE

INTERNATIONAL SCIENTIFIC SERIES.

VOL. LXIV.

α

M.A., F.L.S., F.G.S.

PROFESSOR OF BOTANY, QUEEN'S COLLEGE

AND LECTURER TO ST. BARTHOLOMEW'S HOSP. MED. SCHOOL, LONDON

AUTHOR OF "EVOLUTION AND RELIGION," "CHRISTIAN BELIEFS RECONSIDERED "
"BOTANY FOR CHILDREN," "FLORAL DISSECTIONS," ETC.

WITH EIGHTY-EIGHT ILLUSTRATIONS

LONDON

KEGAN PAUL, TRENCH & CO., 1, PATERNOSTER SQUARE

1888