340 Forestry Quarterly. 



therefore, should approach 31 M., and in the second case where 

 the D. B. H. of the average tree is 24" the volume should approach 

 37 M. As a matter of fact, the volumes on these two acres 

 are respectively only 16,600 and 31,000 B. M. 



Probably many years will be required before it will be pos- 

 sible, in this country, to obtain very extensive normal forests of 

 Yellow pine. Trees will be spaced, not usually by planting as is' 

 the case in most of the German forests, but they will be spaced 

 by means of the axe. That is, the stands will be thinned out, 

 as the increasing size of the trees require, and the spacing will 

 consequently be more or less rough. On very dry soils it will 

 be necessary to make the spacing greater than on moist, for 

 the reason that on a moist soil a tree can put up with a greater 

 degree of shade. The shade is compensated for by the increased 

 allowance of moisture. It has been the endeavor in this report 

 to deal exclusively with average conditions of soil and climate 

 as' they exist. Extreme conditions of soil and climate will al- 

 ways require special treatment. 



In conclusion, it may be said that possibly various statements 

 in this report may lend themselves to criticism as not being suf- 

 ficiently backed up by evidence. It was necessary to make this 

 study entirely a side-issue along with more immediately imperative 

 work of another sort, so that the procuring of much field data 

 was impossible. It is felt, however, that the subject treated is 

 an important one, and, before concluding, it is desired to call at- 

 tention once more to the method described earlier in this report, 

 of measuring the areas occupied by the crowns of Yellow pine, 

 which, it is thought, yielded very satisfactory results. 



The importance of knowing the crown area of trees of all 

 species, for different diameter classes will become increasingly 

 important as it becomes more and more possible and necessary 

 to practice intensive forestry in this country. In planting and 

 thinning, it will be of value in determining the most advantageous 

 spacing of the young trees. In forest management, it will as- 

 sist in estimating the probable future yield of stands. 



By means of sample plots, the various habits and peculiarities 

 of the different species can be graphically shown and compared 

 in a most instructive manner. 



