PERIODICAL LITERATURE 823 



years of age, when planted in mixture with European species, most of 

 the latter were suppressed or killed by it. While the European larch is 

 often grown as a nurse for other species, even beech will not survive 

 in alternate rows with the Japanese species. The latter suffers much 

 more than the former from severe drought and the competition occa- 

 sioned by grass and other vegetation is much more fatal. In the writer's 

 opinion, Japanese larch should be planted only on ground that can be 

 kept clean or that retains considerable moisture in the surface layers of 

 the soil during periods of prolonged drought. 



Aside from its rapid juvenile growth, the advantage in planting 

 Japanese larch in England is its freedom from disease. So far as ex- 

 perience goes, the writer states that when grown successfully it will be 

 a most profitable crop to cut at an early age and perhaps to 40 years, 

 and there is no evidence against its giving good success to a greater age. 



Although the reviewer has little faith in the extensive use of exotics 

 for use in forest planting in eastern United States, from the fact that 

 Japanese trees as a whole are better adapted for growing in eastern 

 United States than species from western Europe, the Japanese larch 

 should be more acceptable than the European larch, which has been 

 planted in many places in this country. 



J. W. T. 



Japanese Larch at Hargham. Quarterly Journal of Forestry. London, April, 

 1918, p. 117. 



Foxworthy has brought together in classified 

 Philippine form our present knowledge of the Philippine 



Dipterocarpacea Dipterocarps. The importance of this large group 

 in tropical forestry makes the paper under review 

 one of particular interest to foresters and dendrologists working in 

 tropical regions or interested in tropical forestry. A synopsis of the 

 Philippine species, published but six years prior to the present paper, 

 recognized 48 species as occurring in the Archipelago. Since then the 

 recognized species has been increased to 70. Common names seldom 

 apply to a single species, but usually to a group of species, often a dozen 

 or more species being designated by the same common name. 



A list is given of the commercial woods of the entire group by their 

 names in the principal markets, followed by all the species known to 

 represent each name. In all, but 10 commercial or trade names are 

 applied to the wood from the entire 70 species. Many new species are 

 described; sojue arc illustrated by line drawings. Keys have been re- 



