vill PREFACE. 
the specimens of trees and shrubs in the Linnean herbarium; as he is to 
A. B. Lambert, Esq., V.P.L.S., &c., for the use of his magnificent library 
and unique herbarium, and for the living specimens of the Conifer from 
Boyton; and to W. T. Aiton, Esq., F.L.S., H.S., &c., Her Majesty’s Garden- 
Director at Kew, for specimens of the trees and shrubs in the arboretum there, 
for the loan of manuscripts, and for other valuable information and assistance, 
communicated either directly by himself, or through that scientific and assidu- 
ous botanist and cultivator, Mr. Smith, foreman of the Kew Botanic Garden. 
To His Grace the Duke of Northumberland the author is indebted, not 
only for access for himself and artists to examine and take portraits of the 
splendid exotic trees at Syon, but for drawings of upwards of a hundred 
of the largest and rarest of those trees, made for this Work by G. R. 
Lewis, Esq., at His Grace’s expense, and also for engravings from several 
of the largest of these drawings. To Mrs. Lawrence of Studley Royal 
he is obliged for the portraits of many of the noble trees in the park 
at Studley, that lady having employed a London artist, H. W. Jukes, Esq., 
for several months for that purpose ; and to the Rev. J. Charnock, for di- 
recting the measurements, and supplying interesting information respecting 
those trees. To the Countess of Bridgewater he is indebted for portraits of 
the gigantic beeches at Ashridge : and to Lady Grenville, for permission to take 
drawings, and for numerous specimens of the Abiétine in the magnificent 
pinetum at Dropmore ; and to Her Ladyship’s intelligent and most industrious 
gardener, Mr. Frost, for supplying valuable information respecting their culture 
and management, and for lending every assistance in his power. Portraits of 
trees, and many specimens, have also been sent by various other persons in 
different parts of Great Britain and Ireland, whose names, lest any individual 
should be by chance omitted, it is not endeavoured here to enumerate. 
The author is also indebted, for portraits, specimens, and information, to 
various amateurs and gardeners on the Continent, as well as to correspond- 
ents in North America and Australia; and more especially to M. Alphonse 
De Candolle of Geneva; to M. André Michaux, M. Vilmorin, M. Loiseleur 
Deslongchamps, and M. Soulange-Bodin, of Paris ; to Baron Jacquin, and M. 
Charles Rauch, of Vienna; to Professor Reinwardt, Leyden’; Professor Kops, 
Utrecht; M. Otto, Berlin; Messrs. Booth, Hamburg; Professor Schouw 
and M. Petersen, Copenhagen; Bishop Agardh, Carlstadt, Sweden; Dr. 
Fischer, Petersburg; M. Fintelman, Moscow; M. Descemet, Odessa; Sr. 
G. Manetti, Monza, near Milan; the Honourable Keppel Craven, Naples ; 
Dr. Mease, Philadelphia ; Col. Carr, of Bartram’s Botanic Garden ; and John 
Thompson, Esq., Surveyor General’s office, Sydney. 
In the literary department the author received the assistance of the Rev. 
M. J. Berkeley, M.A., F.L.S., for the lists of Fungi inhabiting different spe- 
cies of trees ; of J. O.Westwood, Esq., F.L.S., Secretary to the Entomological 
Society, for descriptions and drawings of the Insects infesting different species ; 
of Wm. Spence, Esq., F.L.S., and of M. Audouin, Member of the Institute 
of France,and Professor of Entomology, for information respecting the species 
of Scélytus injurious to the elm; of Mr. John Denson, A.L.S., in drawing up 
