FOREST PATHOLOGY IN FOREST REGULATION. 7 



A rotation based on the financial rotation, possibly modified somewhat towards the 

 rotation of the highest income, is no less adapted to Government forestry than to pri- 

 vate forestry. 



Greenamyre * advocates a financial rotation in the composite type 

 of the Apache National Forest, the " rotation of greatest volume pro- 

 duction being out of question." In his specific recommendations 

 for western yellow pine, Douglas fir, and blue spruce, however, rota- 

 tion of greatest volume plays a far greater role than financial rota- 

 tion. Such important factors in financial rotation as soil capital, 

 quality increment, and rent are neglected or only hinted at. Value 

 increment and depreciation enter into his calculations in a general 

 way only, evidently from a lack of exact figures. 



Barrington Moore 2 expresses himself strongly against the adoption 

 of a financial rotation. 



It would be out of place in this paper to enter into a discussion of 

 the possibility at the present time of fixing a rotation of greatest 

 income or a financial rotation more deeply than to point to the 

 immense difficulties encountered as soon as we try to substitute actual 

 values for the factors entering into their computation derived from 

 experience in our own country. We lack at the present time the very 

 fundamentals on which to base the determination of highest forest 

 rent or highest soil rent. 



The Forest Service has ? in full realization of the uncertainty of 

 almost all factors which would or should enter into a financial rota- 

 tion formula, adopted, for the present at least, a tentative silvicul- 

 tural rotation of maximum-volume production. . 



The factors entering into the determination of silvicultural rotation 

 or of greatest volume being more easily accessible, it is quite natural 

 that American forestry should show a tendency toward its applica- 

 tion, as shown in a number of published and unpublished working 

 plans. 



Attempts at fixing some kind of a rotation age are found in several 

 publications. Woolsey 3 tentatively proposes a rotation of 200 years 

 for yellow pine without giving a basis for the choice of any particular 

 system of rotation. 



Barrington Moore 4 says that on the Plumas National Forest "the 

 rotation should theoretically be that of maximum-volume produc- 

 tion. The use of a financial rotation by the Government, in a region 



1 Greenamyre, H. H. The composite type on the Apache National Forest. U. S. Dept. Agr., Forest 

 Serv. Bui. 125, 32 pp., 4 figs., 1913. (See p. 30.) 



2 Moore, Barrington. The essentials in working plans for national forests. In Proc. Soc. Amer. Forest., 

 v. 6, no. 2, pp. 117-128, 1911. (See p. 126.) 



3 Woolsey, T. S, Western yellow pine in Arizona and New Mexico. U. S. Dept. Agr., Forest Serv. Bui. 

 101, 64 pp., 11 figs., 4 pis., 1911. (See p. 51.) 



4 Moore, Barrington. Chapman's method of studying yield, p. 93, 1913. To accompany forest plan, 

 Plumas National Forest, district 5. Appendix (continued), Silviculture. (Unpublished. Furnished by 

 courtesy of the U. S. Forest Service.) 



