THE 



THEORY AND PEACTICE OF 

 HORTICULTUEE ; 



OR, 



AN ATTEMPT TO EXPLAIN THE CHIEF OPEEATIONS OF 

 GARDENING UPON PHYSIOLOGICAL GEOUNDS. 



BEINQ THE SECOND EDITION OF THE 



THEOEY OF HOETICIJLTUEE, 



MUCH ENLARGED. 



By JOHN LINDLEY, Ph.D. F.R.S. 



Correspondingr Member of the Institute, 



Vice-Secretary of the Horticultural Society, Professor of Botany in University College, Ltjndon, 



&c. &c. &c. 



" Thougli I am very sensible tliat it is from long experience chiefly that we are to expect 

 the m.ost certain rules of practice, yet it is withal to he remembered that the likeliest 

 method to enable us to make the most judicious observations, and to put us upon the 

 most probable means of improving any art, is to get the best insight we can into the 

 nature and properties of those things which we are desirous to cultivate and improve." 



Hales's Vegetable Staiicks, I 376. 



LONDON: 

 LONGMAN, BROWN, GREEN, AND LONGMANS. 



1855. 



