112 FOREST BOTANY AND FORESTRY [BoT. Absts., Vol. VII, 



production of the public forests from 2.7 to 4.4 million cubic meters, thus making the coun- 

 try independent of wood imports aside from exotic timbers. The recently created "central 

 forest office," with headquarters at Soleure, should prove effective in supplementing other 

 activities to awaken public interest in and support of the practice of better forestry. — 

 S. T. Dana. 



758. Barbey, a. Wald und Schlachtfeld. [Forest and battlefield.] Schweiz. Zeitschr. 

 Forstw. 71: 257-261. J+ pi. 1920. — The forest was completely destroyed over large areas, and 

 in other sections there are only dead parts of trees left. In France the estimated areas 

 destroyed include 100,000 ha. state forest, 140,000 ha. community forest, and 275,000 ha. pri- 

 vate forests; also 10,000 to 15,000 ha. in Elsass— a total of about 530,000 ha. (1,325,000 acres). 

 This forest is so completely destroyed by shells and fire that no young growth is coming in. 

 The area is being covered with weeds and shrubs among the tangles of barbed wire and shell 

 holes. Utilization of the remaining dead timber is not feasible in many places unless char- 

 coal industries are developed. Insect infestations are occurring and no doubt will spread 

 rapidly. Reforestation with the species that occurred before will not be possible in some 

 sections where the soil is badly torn up. Such areas may be restocked with broad-leaved 

 species to build up the soil. — J. V. Hofmann. 



759. B(ean), W. J. One-leaved ash (Fraxinus excelsior heterophylla). Kew Bull. Misc. 

 Inf. [London] 1919: 390-391. 1919.— See Bot. Absts. 6, Entry 1631. 



760. Bean, W. J. Garden notes on new or rare trees and shrubs. Kew Bull. Misc. Inf. 

 [London] 1920: 119-124. 1920.— See Bot. Absts. 6, Entry 1843. 



761. Berkhottt, a. H. Het meten der boomen in verband met hun aanwas. [The meas- 

 urement of trees in connection with their growth.] Meded. Landbouwhoogeschool en Ver- 

 bond. Instit. Deel 17: 109-225. 1920. — Uses the standard deviation of individual varieties 

 and of the mean as a measure of reliability. Uses the "correlation factor" in examining rela- 

 tionship such as that between diameter and volume, with coefficients as high as 0.98. Shows 

 the correlation graphically in addition. In some other correlations the values are much 

 lower. "It is indeed unfortunate that in forest mensuration use of probability computations 

 is seldom or never made, for they are especially applicable in forestry."— Carl Hartley. 



762. Bintner, J. Silver leaf disease. Stereum purpureum. Kew Bull. Misc. Inf. 

 [London] 1919: 241-263. PI. 8, fig. 1-8. 1919.— See Bot. Absts. 6, Entry 1936. 



763. BouLGER, G. S. [Rev. of: Henry, Augustine. Forests, woods and trees in relation 

 to hygiene, xii + 314 P-, 50 illus. Constable & Company: London, 1919.] Jour. Bot. 58: 

 157-158. 1920. 



764. BouLGER, G. S. [Rev. of: Stone, Herbert. A guide to the identification of our 

 more useful timbers, being a manual for the use of students of forestry. 72 p., 3 pi. Uni- 

 versity Press: Cambridge, 1920.] Jour. Bot. 58: 230. 1920. 



765. Brown, Forest B. H. The silicious skeleton of tracheids and fibers. Bull. Torrey 

 Bot. Club 47: 407-424. 5 fig. 1920.— See Bot. Absts. 7, Entry 1057. 



766. Burns, George P. Tolerance of forest trees and its relation to forest succession. 

 Jour. Forestry 18 : 610-615. 1920. — A general review of the literature shows a general dis- 

 agreement as to the meaning of the term tolerance. It is used rather indiscriminately in 

 forestry practice but has been tied up with light more often then otherwise. No clear defi- 

 nition has been given and much confusion caused, and the question of what is meant 

 and how it is brought about will have to be solved by forest research. — E. N. Munns. 



