Current Literature 53 



Studies of Trees. By J. J. Levison. Wiley and Sons, New 

 York. 1914. Pp. 253. 



This volume touches in a brief and non-technical way many 

 of the phases of tree study. It includes chapters on the identifi- 

 cation of trees, their structure and biological habits, and their 

 care and protection against diseases. There are also chapters 

 on the treatment of woodland, what trees to plant and how, and 

 on the identification and properties of the commoner woods. 



The text is elementary and intended for the beginner. To 

 facilitate such use in nature study classes, schools, etc., the book 

 is also obtainable in separate pamphlets, each pamphlet dealing 

 with one of the phases mentioned above. 



The rigid uniformity of treatment of all tree species in the 

 first three chapters leaves the reader with no conception of their 

 relative importance — a perspective which would appear to be 

 desirable for beginners. Some of the statements are either mis- 

 leading or uncalled for, which could be avoided even in such an 

 elementary book. The illustrations are not always of value. 



J. H. W. 



Exercises in Forest Mensuration. By Hugo Winkenwerder 

 and E. T. Clark. Published by the authors, Seattle, Wash. 1915. 

 Pp. 146. Price, $1.35. 



This is a manual of field and office exercises designed for use 

 by students of forest mensuration, as a guide to laboratory instruc- 

 tion. It does not purport to cover the entire field of mensuration 

 in detail, but presents a total of thirty-nine type exercises, selected 

 so as to be illustrative of the general field of the subject as pre- 

 sented in Graves' "Forest Mensuration," upon which the exercises 

 are largely based. The general arrangement of the exercises 

 follows that of the textbook above mentioned. Each exercise 

 gives a statement of the prerequisite study, a brief explanation 

 of the purpose of the problem, and detailed directions for carry- 

 ing out the field or office work involved, including under each 

 problem a list of references and usually a few questions designed 

 to bring out the important conclusions to be derived from the 

 exercise. 



