154 Forestry Quarterly. 



Summarizing the silvicultural characteristics of the American 

 species, the superior hardiness of the east American species to 

 the Rocky Mountain species is recognized. It is contended that 

 the cultivation of European species in eastern America may be 

 successful only in Canada, which is of course contrary to facts. 

 As to value for European planting Piniis strobtcs, P. divaiicata, 

 Robi7iia pseudocacia and Pseudotsicga taxifolia are placed first, 

 Hicoria and Juglans next, the Cupresshieae are questionable, 

 and only to be used when no native species of the genus exists. 



Ueber Holzkonservirung durch Petroleum, by A. Adiassevich. 



The author has succeeded in producing a creosote from petro- 

 leum, which is cheaper and superior for impregnating railroad 

 ties, than the usual product. 



Ueber die gesetzmiiszigan, Beziehungen der Ma.ssenfaktoren in 

 normalen Fichtenbestanden, by A. SchiflFel. 



There is here discussed in detail the practical applicability of 

 certain laws of relation between the volumes of stands and the 

 single factors of height, diameter and form factor. The discovery 

 of such laws has the practical result of reducing the amount of 

 measuring necessary to determine the contents and sortiments of 

 a stand. The laws discovered and formulated by Kopezky and 

 Fekete have been tested, and the latter which established a rela- 

 tion Ijetween the diameter, height or form and certain percents of 

 the stem classes has been found to furnish very satisfactor}' means 

 of reducing the amount of measurement necessary. 



The general law which broadens the relationships pointed out 

 by Weise for the average tree is formulated to read : In normal 

 spruce stands a tree corresponding to a given percent, of all the 

 trees has in any stand a given proportion of the total volume, 

 height and form ; or in two different stands the volumes, heights, 

 cross .section areas, form factors and form heights of two trees 

 correspond to the same stem class percent, as the volumes, areas, 

 form factors, and heights of their average trees. 



