1919] FORESTRY. 343 



Weather conditions as affecting plant growth, J. J. Thoknbee (Arizona Sta. 

 Rpt. 1917, pp. 428-^30). — Lists are given of ornamental trees and shrubs on 

 the university grounds and at Tucson that were killed or more or less injured 

 during tlie cold winter of 1916-17 when the temperature fell below 32° F., on 

 an average of one out of every three nights, witli minimum temperature of 

 9° F. A list is also given of ornamental trees and shrubs, mostly exotic, 

 which were not injured in the least. 



A complete list of annual and other flowers, including greenhouse, tender 

 and half-hardy" perennials which, in Canada, can not be classed as hardy 

 perennials (Ann. Rpt. Hort. Socs. Ontario, 13 (191S), pp. 7.'/-78). — The list here 

 presented was prepared by the Committee on Names and Varieties of the 

 Ontario Horticultural Association. 



The preservation of pollen for hybridizing, A. P. Saunders (Bui. Peony 

 News No. 6 (1918), pp. 2-9). — A partial review of the literature on the preser- 

 vation and viability of pollen of various plants which have been prepared for 

 special use in liybridizing peonies. The author concludes that peony pollen 

 under favorable conditions is very long-lived, and that there should be no diffi- 

 culty in carrying it through the entire season from the earliest to the latest 

 blooming species. 



Horticultural libraries in the United States, M. F. Waenee (Gard. Chron., 

 3. ser., 65 (1919), No. 1691, p. 2-'}7). — This is largely a resume of the scope of 

 the horticultural literature in the library of the U. S. Department of Agriculture. 



FORESTRY. 



National afforestation, A. D. Webster (London: T. Fisher TJmcin, Ltd., 1919, 

 pp. 160). — In this work the author sketches the history of British woodlands, 

 presents evidence to show the approaching dearth of timber, and makes an 

 appeal for national afforestation in the United Kingdom as opposed to private 

 and comnmnal activities. Data are given on the cost of establishing planta- 

 tions, with actual figures from English, Scottish, Welsh, and Irish estates, to- 

 gether with the details of afforestation practice, a list of the best trees for 

 economic planting, and examples of financial returns. Recommendations rela- 

 tive to a national forest policy, the establishment of schools of forestry, and the 

 use of unemployed labor in forestry are also included. 



Commercial forestry (Min. Reco)istr. [Gt. Brit.], Reconstr. Prob. No. 11 

 (1919), pp. l.'f). — This pamphlet is prepared with special reference to forestry 

 problems in the United Kingdom. It discusses the position before the war, the 

 position in 1918, the scope of commercial forestry, the i*enovation and extension 

 of forest areas, and other important factors in a forest scheme. A concrete ex- 

 ample of an afforestation scheme deemed suitable to the conditions of Great 

 Britain is briefly outlined. 



Forestry, S. Honda and Y. Takenob (.Japan Year Book, 1918, pp. 562-569). — 

 A statistical acc<nmt of the forests and forest industry in Japan. 



A forestry policy for New Zealand, F. Bell (Jour. Agr. [New Zeal.], 18 

 (1919), No. 5, pp. 313-318). — An address given at the Conference of Crown 

 Lands Commissioners, in which the author briefly discusses present conditions 

 of forest management in New Zealand and presents suggestions relative to the 

 foundation of a policy for the future. 



Reclamation of sand dunes, E. P. Turner (Jour. Agr. [New Zeal.], 18 

 (1919), No. 3, pp. IJfS-loIf, figs. 3). — Instructions are given for fixing and afforest- 

 ing sand dunes under New Zeland conditions, together with a translation of 

 an article by E. D, Van Dissel oo the treatment of sand dunes in Holland. 



