INTRODUCTION. 5 
trees. The photographs of the branches bearing leaves, buds, flowers, 
and seed cases were taken in each instance from a specimen fastened to 
the trunk of the tree upon which it had grown, by this means showing 
fairly well the nature of the bark of the tree. It is thus attempted 
in each of these latter photographs to illustrate the principal features 
upon which the species are based, and it is hoped that they will be 
found helpful in identifying trees the names of which are unknown 
or doubtful. 
