PERIODICAI, I.ITHRATURE 805 



The proposed law forbids clear cutting- of 

 Clear Cutting more than 1/60 of the area of a forest unit, or 

 in Prussian excessive thinnings, without special permit. It 



Private Forests applies to high forests or similar forests, but not 

 to coppice forests. All privately owned forests 

 are subject to this law, except those managed cooperatively, which are 

 already provided for. This law is intended to prevent forest devasta- 

 tion, which is threatened, especially near the towns, until the proposed 

 new law regarding forest culture can be passed and made effective. 

 At present there is no legal way to prevent devastation of private for- 

 est lands in Prussia. — Comments on the law, by Dr. Bartog, are ap- 

 pended. W. N. S. 



Anonymous. Entumrf eincs preussischen Geseises iiber Kahlschl'dge in Pri- 

 vatwaldungcn. Deutsch. Forstztg, 36:39-41, 1921. 



Investigators in dift'erent regions have dis- 

 Generation of agreed as to the length of generation of the 

 the. Weevil weevil, some finding a period of 15 months from 



tgg to imago (2-year generation), others 12 

 months (1-year generation), and others 3 to 5 months (2 generations 

 per year). All three positions are supported by reliable data. The 

 difference appears to be due to climatic differences. It is suggested 

 that in regulated forests, where the cutting is more or less concentrated 

 in space and season, the emergence of the beetles is likewise concen- 

 trated and more likely to prove harmful, than where, as in a virgin 

 stand, the beetles come out at various times through the year. 



W. N. S. 



Escherich, K. Die Generationen des grossen braunen Rilsselkdfers (Hylobius 

 abietis). Forstwiss. Centralbl., 42:425-431, 1920. 



The arrested development of pine and spruce 

 Pine and Spruce stands, common in certain parts of the Upper 

 Plantations Palatinate, is attributed to plant and animal 



enemies, principally the heather, which tem- 

 porarily suppresses the young trees, the blight, and various leaf-rollers. 

 Various methods of improving soil conditions have been tried, in order 

 to keep down the heather and enable the trees to resist their other 

 enemies. The best results were obtained by grubbing out the heather, 

 or by sowing broom, larch or possibly Pinus strobus a'mong the young 



