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Nulla ibi immodicaventorum vis, nulla tempestatum procella, nullus hyemis
horror, non nimia veris humiditas, non torrena aeBtatis ardor, non moleata et
noxia autumni siccitas, sed temperata et pacifica omnium temporum inter se
consonantia.—Rolfinius.

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SECOND EDITION.

LONDON:

JOHN VAN VOORST, PATERNOSTER ROW.

-M.DCCC.LII.

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LONDON:

Printed by Samuel Bentley and Co.

Bangor House, Shoe Lane.

PREFACE TO THE FIRST EDITION.

Most of the facts detailed in the following work have been long before the public. They have been published in several periodicals, and in a letter to Sir W. J. Hooker, which appeared in the " Companion to the Botanical Magazine" for May, 1836. This letter was subsequently printed separately for private distribution among the Author's friends. The attention of the scientific world was likewise drawn to the subject at three several meetings of the British Association, and more particularly by an admirable paper written by the late Mr. Ellis, of Edinburgh, and published in the "Gardener's Magazine" for September, 1839. The simple yet comprehensive principle, however, upon which plants are grown in closed cases, does not appear to be clearly understood, and many misconceptions yet exist upon this point. The object of the present work, therefore, is to remove these erroneous notions, and thereby to enable those who wish to experiment upon the subject to do so without risk of disappointment. The Author is fearful that in

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