vi PREFACE 
I must, as in the first series, acknowledge my 
indebtedness to many writers whose works I have laid 
under contribution, but more especially to the artists 
the results of whose labours form the main attraction 
of this book, to Messrs. W. H. J. Boot, R.B.A., and 
A. Fairfax Muckley, who have painted the originals 
of the coloured plates; to Messrs. J. A. Weale and 
F. W. Saxby, who have made and photographed the 
microscopic sections of woods and pine-needles ; and 
to Messrs. F. Masoh Good, H. Irving, and E. J. 
Wallis, from whose photographs the uncoloured plates 
of trees are taken. 
G. S. BOULGER. 
