45G JOURNAL OF FORESTRY 



The Pseudotsitga association is limited in the foothills to north 

 slopes, where it forms small local stands of varying density. In the 

 more open of these the western yellow pine is also usually found. 



The canyon forest association is composed of mesophytic deciduous 

 trees which generally grow to only small size, as alder, birch, willows, 

 aspen, maple. 



The aspen association occurs very rarely in the foothills region, 

 being limited to permanently- moist, cool canyon bottoms with deep, 

 rich soil. In the montane region above it spreads into a much wider 

 range' of sites. 



This study is a valuable contribution toward the stabilization of 

 our conceptions of the chief associations in the Colorado front range 

 foothills. Not until associations are blocked out, described, and dif- 

 ferentiated as clearly as possible will it be possible to use their names 

 in any definite sense, as is becoming so increasingly necessary in forest 

 and ecological literature . 



F. S. B. 



Ldrken och dess Betydelse for Svensk Skogshushallning. (The 

 Larch and Its Importance in Swedish Forest Economy.) By Gunnar 

 Schotte. Meddelanden fran Statens Skogsforsoksanstalt. Haft 13- 

 14, 1917, pp. 531-840. 



This most comprehensive — indeed, monumental — and profusely illus- 

 trated monograph aims to state the results attained up to date in 

 larch cultivation in Sweden. The main basis has been the sixty-six 

 experimental plots of the State Institute of Experimental Forestry. 

 The literature on the subject, foreign as well as Swedish, has been very 

 fully made use of, and not less than 663 references are cited. 



At the outset the author devotes some space to pointing out the 

 special importance of introductions in the case of Sweden, owing to 

 the paucity of species, the native coniferous forests consisting of only 

 Scotch pine and Norway spruce. After a second chapter, devoted to 

 a description and classification of the nineteen difl^erent species of 

 larch, Schotte proceeds to a consideration of each species, most atten- 

 tion being given to the European, Siberian, and Japanese forms. 



The treatment is in each case uniform, describing its introduction 

 into Sweden and other countries, present occurrence in Sweden, varie- 

 ties and races, silvicultural properties, regeneration and culture, thin- 

 ning, productivity, insect pests and fungus diseases, properties and 

 uses of timber. 



