Periodical Literature 519 



Oppermann reports from the Danish 



Assortments Experiment Station the percentage of assort- 



in ments graded into three principal classes in 



Beech beech 67 to 115 years old. The material 



taken to a 4-inch limit averaged 52.6 per 



cent of class I, suitable for manufacture; 30.6 per cent split fuel; 



16.8 per cent round billets. Cut into 26-inch sections, the amount 



of clear material fit for manufacture was represented by the 



following volimie percents : 



Section.... 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 IS 

 Per cent... 100 96 88 85 79 71 57 47 42 34 27 15 9 7 2 



The three classes of material are further divided into three 

 grades each and their participation from section to section tabu- 

 lated. 



Data in considerable detail are given to show what amounts of 

 each class of material can be expected at different ages and 

 different degrees of density. 



The resum^ is that young stands should be stocked sufficiently 

 dense to prune very early; the first thinning to remove only 

 defective and crooked trees until the bole is cleared for 25 to 40 

 feet, according to site. When this is attained, say at 45 to 60 

 years of age, the thinnings should be made so as to prevent further 

 clearing. This severer thinning, however, must come gradually, 

 especially if the earlier thinning practice was neglected. Under 

 good management, class I material may be cut at 40 to 50 years of 

 age and will increase to 60 or 70 per cent of total volume ; but in 

 poorly managed stands may drop to 20 or even 30 per cent below 



this. 



J. A. L. 



Hoidelag i Bogebevokstinger . Det Forstlige Forsogsvaeseu, Vol. IV, No. 1, 

 1913. 



Apropos of the capture of Erzerimi by 



Picea the Russians, A. Jolyet reviews the char- 



orientalis acteristics of the Oriental spruce {Picea 



orientalis) . According to Jolyet , this species 



of the spruce genus is found below 40° north latitude "in a climate 



both hot and dry in siunmer." 



In the native habitat, the annual rainfall is said to be less than 



