274 Forestry Quarterly. 



1862, 1869, 1874, 1879, 1883, 1889, 1894, 1900, 1905 and 1912, 

 one area always with a light (A-grade) thinning, another with 

 a moderate (B-grade) thinning, and the third with a heavy (C- 

 grade) thinning. 



The results show that the heavy thinning in no way retards 

 the height growth, that it, in fact, reacts favorably thereon. Most 

 interesting is the comparison of the volume increment of the 

 three areas. 



Total final yields of A grade thinningr=7,693 cu. ft. per acre. 



Total final yields of B grade thinning=8,i65 cu. ft. per acre. 



Total final yields of C grade thinning=9,438 cu. ft. per acre 



or an increase of 22.7% over A grade and 15.6% over the 



B grade area. 



Another important result is that the heavy thinning does not 

 bring about a lessened clear-length (lower crowns) but, on the 

 contrary, an increased clear-length commensurate with the greater 

 height growth. 



Regarding the form of the bole, Dr. Kunze, the investigator, 

 himself says: "The experiments by no means justify the assump- 

 tion that heavy thinning of Scotch pine means poor form of the 

 stems," 



The volume increment is greatly stimulated by the heavy thin- 

 ning; the exact figures are not given in Dr. Weber's review. 

 (The results are published by Paul Parey, Berlin and sold at 38c 

 a copy.) 



All in all, concludes the reviewer, these results coincide with 

 similar experiments elsewhere and are an additional argument in 

 favor of heavier thinnings. A. B. R. 



Mitteilungen aus der Kgl. Sdchsischcn forstlichen Versuchsanstalt zu 

 Tharandt. Allgemeine Forst- und Jagd- Zeitung, March, 1914, pp. 93-95. 



Weber reviews the latest bulletin of the 

 Influence Swiss Experiment Station on the Influence 



of of the Source of Seed upon the Character 



Source of Forest Growth. Readers of the quar- 



of TERLY, however, need no extract of Web- 



Seed. er's article, since an excellent brief of the 



bulletin itself is given in a review thereof 

 by Director Toumey in the "Proceedings of the Society of Ameri- 

 can Foresters," Vol. IX, No. i, 1914, pp. 107-113. 



