88 Forestry Quarterly 



susceptibility to various forms of injury, and silvical characters. 



Tables are given for the three leading species, relating diameter, 

 height and age, on various sites in various States. 



Yield tables from 62 sample plots, aggregating 17 acres, in 

 comparatively pure, even-aged stands (about half in plantations), 

 show 38,000, 28,000 and 18,000 board feet per acre on sites I, II 

 and III respectively, at 80 years. 



A calculation is presented showing the interest on investment 

 to be expected from quality I, II and III stands for stumpage 

 values of $5, $10, $15 and $20 per M feet, and for total invest- 

 ments ranging from $5 to $30 per acre. According to this, the 

 best financial rotations fall between 30 and 60 years. "Where 

 quality I yields and $20 stumpage are to be obtained, the operator 

 may spend as much as $20 per acre in buying land and establish- 

 ing a stand of ash and still get 6 per cent on the investment. 

 Where quality II or average yields and $20 stumpage are to be 

 obtained, it is possible to get 6 per cent interest on an investment 

 of $10 per acre. Quality III yields with $20 sttmipage will only 

 pay a little over 5 per cent on an original investment of $5. It 

 may be said in general that growing ash timber as a profitable 

 investment is practically limited to lands which will produce 

 good yields of ash and which do not cost over $10 or $15 per acre." 



For commercial timber growing the White and Green ash are 

 the more desirable. Directions are given for reforesting by either 

 natural or artificial means, the author preferring the former method 

 where feasible. 



An appendix of 26 tables comprising bark, form, volume, and 

 yield tables for the leading species is added. 



On the whole this bulletin is of a superior character. 



J. H. W. 



Willows: Their Growth, Use and Importance. By G. N. Lamb. 

 Bulletin 316, U. S. Department of Agriculture. Contribution 

 from the Forest Service. Washington, D. C. 1915. Pp. 52. 



This bulletin opens with a description of the dozen or so species 

 reaching fair tree size. Of these, the only native one of economic 

 importance is the Black willow {Salix nigra) , which is a large tree 

 of rapid growth and widely distributed. Accordingly, the major 

 portion of the bulletin is devoted to this species, with special 



