REVIEWS AND NOTICES OF BOOKS. 93 



latter class is increasing (in America) and already holds large 

 areas in the aggregate." 



The period which intervenes between the time of establish- 

 ment and the reproduction period receives similarly exhaustive 

 treatment. Intermediate cuttings are classified under the 

 headings : — Thinning, Improvement cutting, Salvage cutting, 

 Severance cutting. Pruning. 



In discussing the methods of making thinnings the author 

 says : — 



"Crown classes furnish the principal basis for cutting or 

 leaving a tree, and the relative position of the crown of 

 each tree must be observed with respect to its associates. 

 The highest production as a result of thinning can be 

 secured by leaving the largest number of trees per acre 

 consistent with rapid growth of the individual." 



No forester will dispute the soundness of these views, but the 

 idea that the basal area at breast-height, which is easily 

 measured, should be substituted as an expression for the total 

 crown spread is not likely to meet with general acceptance. 

 The concluding chapters are devoted to Methods of Controlling 

 Cuttings, Slash Disposal, and Forest Protection. 



The simple diagrams used throughout the book to illustrate 

 the text are excellent. A list of references is given at the 

 end of each chapter, and the terminology used is explained in 

 an appendix. The author does not claim originality for the 

 greater part of the work. " The presentation of the subject is 

 from the standpoint of the teacher, and the arrangement and 

 discussion are shaped in a manner to which it is believed will 

 be clear to the student." The book will, however, repay careful 

 study by all classes of foresters. 



Forest Products: Their Manufacture and Use. By Prof. N. C. 

 Brown. Pp. xix-i-471. New York: John Wiley & Sons, 

 Inc.; London: Chapman & Hall, Ltd., 1919. Price 

 2 IS. net. 



The author of this work is Professor of Forest Utilisation at 

 the New York State College of Forestry, Syracuse University, 

 and he was appointed also as Trade Commissioner, United 

 States Timber Trade Commission, to Europe. His qualifications 



