446 CURRENT OR PERIODIC GROWTH OF STANDS 



directly the density of the stand, and by predicting growth on basis 

 of actual volume and conditions. It loses in comparison, because it 

 measures only one current section of the growth curve for the stand or 

 forest, which may be above or below the mean, and because the basis, 

 the individual tree, while accurate to start with, rapidly loses its reli- 

 ability, while by contrast, yield tables retain a fair degree of reliability 

 over long future periods. 



Current growth, if it is actually measured in terms of volume, and 

 the errors of using growth per cent are avoided, is well adapted to answer 

 questions regarding the immediate future growth of specific stands, 

 but is poorly adapted to growth predictions covering long periods. 



References 



Growth Rate in Selection Forest. Der Gemischte Buchen Plenterwald auf Muschel- 



kalk in Thiiringen, Mathes, Allgemeine Forst- u. Jagdzeitung, May 1910, p. 



149. Review, Forestry Quarterly, Vol. IX, 1911, p. 129. 

 Increment in Selection Forests. Zur Ermittlung des laufenden Zuwachses speziell 



im Plenterwalde, Christen, Schweizerische Zeitschrift flir Forstwesen, Feb. 



1909, p. 37. Review, Forestry Quarterly, Vol. VII, 1909, p. 206. 

 A Method of Investigating Yields per Acre in Many-aged Stands, H. H. Chapman, 



Forestry Quarterly, Vol. X, 1912, p. 458. 

 Accelerated Growth of Spruce after Cutting, in the Adirondacks, John Bentley, 



Jr., Journal of Forestry, Vol. XV, 1917, p. 896. 

 Method of Regulating the Yield in Selection Forests, Walter J. Morrill, Forestry 



Quarterly, Vol. XI, 1913, p. 21. 

 Determination of Stocking in Uneven-aged Stands, W. W. Ashe, Proc. Soc. Am. 



Foresters, Vol. IX, 1914, p. 204. 

 The Relation of Crown Space to the Volume of Present and Future Stands of Western 



Yellow Pine, George A. Bright, Forestry Quarterly, Vol. XII, 1914, p. 330. 

 Remeasurement of Permanent Sample Plots, G. A. Pearson, Forestry Quarterly, 



Vol. XIII, 1915, p. 60. 

 Observations in Connection with Annual Increment of Growing Crops of Timber, 



Transactions of Royal Scottish Arboricultural Society, July, 1918, p. 164. 



