THE

INTERNATIONAL SCIENTIFIC SERIES.

VOL. LXXVII.

DR. F. W. WENT

THE ORIGIN

OF

PLANT STRUCTURES

BY SELF-ADAPTATION TO THE

ENVIRONMENT

BY THE

REV. GEORGE HENSLOW

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

AUTHOR OF "THE ORIGIN OF FLORAL STRUCTURES," ETC. ETC.

LONDON

KEGAN PAUL, TRENCH, TRÜBNER, & CO. LTM

PATERNOSTER HOUSE, CHARING CROSS ROAD

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"The end of our foundation is the knowledge of causes and secret motions of things."-BACON.

"What determines molecular motion? The fundamental problem of Nature."-CROLL.

"The direct action of the medium was the primordial factor of organic evolution."-SPENCER,