Current Literature. 455 



has ill the United States (presumably in National Forests) varied 

 from, 2.5 to 10 cents per M feet. The diameter limit is broadly 

 discussed. 



The strip system with marginal seeding described under alter- 

 nate cleared strips, is perhaps more widely applicable than is 

 intimated, namely, wherever uniform stands of light-needing 

 species, e. g.. Southern pineries, are to be operated and systematic 

 transportation can be cheaply provided. 



It seems to us a misconception of terms to place the proposed 

 treatment of Longleaf pine in two cuttings separated by a period 

 of from 10 to 20 years under shclterzvood method. As the name 

 implies, this is a method of providing shade or shelter for the 

 young crop and certainly the Longleaf pine would resent such 

 shelter even more than the Scotch pine. The description of the 

 procedure answers rather more a seed-tree method, or according 

 to the author, a clear-cutting, reserving seed trees. 



While fori a layman's easiest comprehension it might have been 

 better to classify these operations more subordinately by genus, 

 species and variety of procedure; the reader will by the more co- 

 ordinate classification be more impressed with the fact that there 

 are many ways of doing, dependent in their applicability on 

 natural and economic conditions. 



The chapter on improvement cuttings (thinnings) brings all 

 that is essential. Over 80 pages, one-quarter of the volume, is 

 taken up by a discussion on protection against fire; and 12 pages 

 on protection from other injurious agencies. 



One is left with the impression that a number of the silvicul- 

 tural methods described are in actual operation in this country. 

 It would be a useful piece of work, of more than historical value,, 

 for the Forest Service to collate with sufficient detail all the 

 cases, where actually and consciously silvicultural methods have 

 been applied. 



We can only hope that this volume will come into the hands 

 of many woodland owners wdio can make use of it. It will be 

 first class reading for all underforesters, and even the students of 

 higher degree can only benefit from its perusal. 



B. E. F. 



Light in Relation to Tree Grozvth. By Raphael Zon and Henry 

 29 



