196 Forestry Quarterly. 



to the distribution of the age classes. The recommendation for 

 the treatment of the forest is on a basis of cutting to a diameter 

 limit. This is suggestive of the similar conditions obtaining in the 

 pine and cedar forests of the mountains of India. There the forests 

 in many places are composed of intolerant species occurring in even- 

 aged patches similar to the conditions described in California. The 

 first work of forestrj^ on such areas is necessarily a conversion from 

 the irregular virgin forests which are composed of even-aged groups 

 of varying sizes to the regular even-aged stands which result after 

 the lumbering. 



The recommendations of Mr. Cooper seem to be very practical 

 and they should result in a forest of high productiveness. They 

 should insure excellent silvicultural results. A working plan for a 

 specified forest reserve or a portion of a reserve would be of great 

 interest, particularly in connection with the future yield of the even- 

 aged patches, the distribution of the age classes and the guarantee 

 of an indefinite supply of merchantable timber. The volume tables 

 and tables of growth are of interest and value. It is unfortunate 

 that the tables of growth are given without any explanation of the 

 number of trees and range of trees classes on which they were based. 

 It is my belief that the volume tables would be of greater value if 

 constructed for a larger range of heights than merely two classes. 

 Altogether, Mr. Cooper's bulletin is one of the best contributions re- 

 cently made to the knowledge of American forestry. 



H. S. G. 



Grades and Amount of Lumber Sawed from Yellow Poplar, Yellow 

 Birch, Sugar Maple and Beech, by Edtvard A. Braniff. Bulle- 

 tin No. 73, U. S. Forest Service, Washington, 1906. 



This bulletin is of special interest because it records the results 

 of a new and very practical line of work by the Forest Service. The 

 investigation is designed to show the amount of lumber of different 

 grades in logs and trees of different sizes. The bulletin shows the 

 results of the measurement of yellow poplar in the South and of the 

 common hardwoods of the Adirondacks. The work is based en- 

 tirely on mill scale studies. The yellow poplar was studied in large 

 sawmills in south-eastern Tennesee and in Virginia. Nearly 1,500 

 trees were traced through a Tennesee mill and 315 trees were meas- 

 ured in Virginia. The actual product of each tree in lumber of dif- 

 ferent grades was determined at the mill and tables conptructed to 



