152 Forestry Quarterly. 



Uebersicht der durchschiiittlichen Verwertungsprei.se fiir ein 

 Festtneter aller Holzarten und Sortimente in den Preussischen 

 Staatsforsten im Etatsjalir, 1900. A detailed account of wood 

 prices with quantities sold. Wood, taking the average of logs 

 and cordwood, increased 8 per cent, in price over the previous 

 year. 



Centralblatt fi'ir das Gesammte Forstwesen. 



Die forst-und volkswirthschaftliche Bedeutung der Anbau- 

 versuche mit nordamerikanischen Holzarten fiir Deutschland 

 und Nord-Amerika. By Dr. Unwin. (Continued from Janu- 

 ar}^ and through April and May numbers.) 



In the first two numbers the American species introduced into 

 Germany are enumerated with some of their characteristics. In 

 the last two issues their silvicultural requirements and treatment 

 are discussed in a manner highly interesting to American for- 

 esters. It is stated that the American species of spruce, fir, larch, 

 oak, elm, maple and ash are subject to the same physiological 

 and silvicultural laws as the corresponding European species, 

 that the}' may be treated like these and then furnish products 

 equal in qualit}^ and in the time required for production. These 

 conclusions, especially the last two, can hardl}' be correct in their 

 generality, since our many species of oaks, ash, maple are well 

 known to vary themselves in quality, rate of growth and ecologic 

 adaptation. 



From the discussion of single species the following remarks 

 may be briefly noted : 



Acer saccharinuni and A. yiegundo are not considered as forest- 

 ally important. A. saccharum is supposed to be like A. 

 platanoides and is called half tolerant and a rapid^ grower, while 

 with us it appears most shade enduring and of rather slow 

 growth. 



Betula lutea is compared to the European birches in all silvicul- 

 tural requirements. This is undoubtedly an error, there can 

 hardly any similarit)' be found ; for B. papyrifera it would per- 

 haps be true. 



Hicoria ovata on account of its slow development for the first 

 decade should only be introduced in groups between rapid grow- 

 ers and then only on best soils, H. glabra thrives on poorer soil, 

 H. niiyiitna in spite of its more rapid growth is said to deserve no 

 consideration. 



