LONDON:

Printed by A. & R. Spottiswoode, New-Street-Square.

MEMBER OF THE IMPERIAL ACADEMY NATURÆ CURIOSORUM OF BONN;
OF THE BOTANICAL SOCIETY OF RATISBON;

AND OF THE PHYSIOGRAPHICAL SOCIETY OF LUND;
CORRESPONDING MEMBER OF THE LINNÆAN SOCIETY OF PARIS;

ASSISTANT SECRETARY OF THE HORTICULTURAL SOCIETY;

AND

PROFESSOR OF BOTANY IN THE UNIVERSITY OF LONDON.

LONDON:

PRINTED FOR

LONGMAN, REES, ORME, BROWN, AND GREEN,

PATERNOSTER-ROW.

46169.

BLIOTHEQUE CANTONALE LAUSLIMME

ST UNIVERSITAIRE

TO

SIR JOHN SAUNDERS SEBRIGHT, BART. M.P.

OF BEECHWOOD, IN HERTFORDSHIRE;

THIS WORK

IS VERY RESPECTFULLY INSCRIBED,

BY

THE AUTHOR.