Periodical Literature. 471 



cent at least of the light needing species is desirable and favoring 

 the same by reducing the beech. 



Zur Frage der Mischbestdnde. Allgemeine Forst-und Jagdzeitung, 

 March, 1914, pp. 90-93. 



Dr. Kunze reports from the Saxon ex- 

 Influence periment station the results of 50 years' of 



of thinning experiments in a stand of Scotch 



Degrees pine, 20 years old at the start which on 



of three sample plots was thinned ten times, 



Thinnings. lightly (a), moderately (6) and severely 



{c). The final measurements were made 

 in 1912 when the stand was 70 years old, by the method of 

 sample trees, due attention having been paid to stem classifica- 

 tion. The results agree with what other investigators have found. 

 Severe thinnings are most effective ; they do not curtail the height 

 growth, but on the contrary stimulate it more than the other two 

 degrees. In total production the c-grade furnished 22.7% more 

 than the a-area, and 15.6% more than the &-grade. It appears, 

 however that the three areas were not equally stocked at the be- 

 ginning, which vitiates the value of the figures. The severe thin- 

 ning did not lengthen the crown but on the contrary shoved the 

 crown up in proportion to the great height growth; the crown 

 diameters also show great regularity in gradation, as appears from 

 a comparison of branchwood to bole wood, the boles being also 

 more cylindrical. 



Mitteilungen aus der Kgl. Sachsischen forstlichen Versuchsanstalt zu 

 Tharandt, Band I, Heft 2, 1913. 



The attempts at the introduction of 



Exotics exotics for forest purposes in Saxony dates 



in back only ten years. The results are dis- 



Saxony. cussed by Neger. Expectations were in 



many cases not fulfilled. Causes of failure 



were mainly damage by game and misplaced expectations on the 



ability of exotics to thrive on untoward sites and especially to 



severe frost conditions which the clearing system followed to an 



extreme in Saxony has produced. Abies concolor has failed for 



