96 THE AMERICAN BOTANIST 



tree book is entitled "A Key to the Trees" by J. Franklin Col- 

 lins and Howard W. Preston and is based primarily upon leaf 

 characters. Outline drawings of the leaves of all the trees 

 are given and in most cases small photographic illustrations 

 of the bark, also. Unlike most books of this nature the key 

 runs entirely through the text. The leaves are exactly describ- 

 ed, and in addition there is considerable information about 

 the flowers, fruit, twigs and bark. To the reviewer, the key 

 appears a trifle involved, and it would seem that it might be' 

 enhanced in value of broken up into several keys to smaller 

 groups. It is likely, however, that the average student will 

 have little trouble on this score, especially since the language 

 of the key is decidedly untechnical and the volume is of a size 

 to fit into the pocket and so destined to be used in the field 

 where plenty of material for identification is available. The 

 book is published by Henry Holt & Co., New York at $1.35 

 net. 



