x PREFACE. 
profitable cultivation of the timber trees that are tried and 
known to be adapted to our climate, and of averting those 
casualties which at various stages of their growth are apt 
to assail them. 
With respect to numerous trees of recent introduction 
from various quarters of the world, many of them are no 
doubt interesting and ornamental, and it is hoped many 
will prove valuable to the country; but until their hardi- 
ness and vigour have been ascertained, and until they 
become far more plentiful and cheap than they now are, 
they cannot be recommended for profitable timber. 
Tue NorsERizs, FoRRES, 
October 1868. 
