Forestry in America. 57 



Seed Production and Hozc to Study It: Discussion.'-' By S. T. 

 Dana, Bristow Adams, and Raphael Zon. Vol. VII, No. i. 



This paper is wholly differcnl from any of the others, except Mr. 

 Herbert A. Smith's "Some Further Considerations Regarding Tolerance 

 and Intolerance of Shade," in Vol. Ill, No. i, in that it is a discussion 

 of an anicle which lias already appeared in the Proceedings. Mr. Dana 

 takes the position that Mr. Zon's sample-plot method of studying seed 

 production is too complex and expensive; furthermore it is analogous to 

 the use of yield tables in finding the volume of stands, and yield tables, 

 he says, are of but little use in our irregular forests. His alternative 

 would be to estimate the seed crop by single trees instead of by area, 

 using a previously constructed "seed-volume-table," just as a timber esti- 

 mator uses a volume table of board contents. 



Mr. Bristow Adams has no faith in either method of studying seed 

 production and believes that there are other problems which are more 

 in need of solution. He gives methods of increasing the seed crop of 

 individual trees. Then follows Mr. Zon's reply to Mr. Dana and Mr. 

 Dana's reply to Mr. Zon, at the end apparently neither being converted. 

 The discussion serves to bring out the advantages and disadvantages of 

 each method. 



Forest Planting in Northern Michigan. By William B. Piper. 



Vol. VII, No. 2. 



This paper relates to the planting done by the Forest Service on the 

 Michigan National Forest. The work has been almost wholly experi- 

 mental ; something of value has been learned, but much further experi- 

 mentation will be necessary. 



VIII — Mensuration. 



Timber Estimating. By Herman Haupt Chapman. Vol, IV, 

 No. I. 



Professor Chapman, and one or two other foresters in the country 

 doubtless understand forest maps and timber estimating better than any- 

 one else. The interest and value of this article is therefore obvious. It 

 is a brief outline of some of the more important methods of timber esti- 

 mating and of the principles underlying them. Timber estimating is of 

 course the phase of the profession closest to the old timber cruisers, a 

 work in which foresters, lacking the experience of the timber cruisers, 

 have surpassed these formerly infallible men by the use of scientific 

 methods. 



A Method of Studying Growth and Yield of Longleaf Pine 

 Applied in Tyler Countv, Texas. By Herman Haupt Chapman. 

 Vol. IV, No. 2. 



Of all the methods of stud3'ing yield devised by foresters, this is the 

 most original and interesting. There can be no question that tJie method 



* The original paper of the same name by Raphael Zon and C. R. Til- 

 lotson appeared in Vol. VI, No. 2. 



