REVIEWS 345 



The rotation age (an unnecessary addition!) is based on diameter, 

 for most species 14 inches. We object professionally to this misuse 

 of "rotation" in tables 5 and 6. Rotation is a term applicable only to 

 a whole working group or forest as a whole, the time within which the 

 whole forest will be cut over, while here merely the time required by 

 trees of different species to attain a certain diameter is intended, which 

 is better called "felling age." This felhng age varies in the same stand 

 from 55 to 180 years. 



Planting plans for the open agricultural ground are made, averaging 

 80 acres per year, with a uniform spacing of 6 by 6 feet for all sites 

 and all species — white, red, and Scotch pine; Norway and Douglas 

 spruce — which for park purposes may be good enough, but for silvi- 

 cultural purposes is at least a doubtful proceeding. 



To the professional reader the collection of growth tables, derived 

 from various sources, will be welcome. 



The collecting of data and the forest survey was done by C. H. 

 Guise, of Cornell University, under the direction of Commissioner 

 Moody. 



Proof-reading in the botanical list of plants is carelessly done. 



B. E. F. 



Plant Materials of Decorative Gardening: The Woody Plants. By 

 William Trelease, Urbana, Illinois. Published by the author. 



A number of books and pamphlets of handy size for field use have 

 appeared in recent years descriptive of our indigenous trees and shrubs 

 of particular regions. These publications have been highly useful to 

 the forester in enabling him to identify the woody species that naturally 

 occur in the regions covered by them. There have been few similar 

 publications useful to the forester in identifying the numerous trees 

 and shrubs used in landscape architecture and in street planting. .Al- 

 most every forester is called upon at times to identify trees and shrubs 

 used for decorative purposes. The small, handy volume of pocket size 

 recentlv published by Dr. Trelease should be available for every for- 

 ester practicing his profession in eastern United States. The purpose 

 of the book is to make it possible for any careful observer to learn the 

 generic and usually the specific name of any hardy tree, shrub, or 

 woody climber that he is likely to find cultivated in eastern United 

 States, apart from the extreme south. There are enumerated and classi- 

 fied 247 genera and 782 species, with some 375 minor forms, or over 

 i.r^o distinct kinds. Tti order to keep the book compact and of size to 



