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 tre'e upon which it had grown, b} r 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. 



