FORESTRY. 49 



weight tents was processed with a material claimed to make the fabric mildew- 

 proof; gas, water, ami air tight; only slightly resistant to sunlight; and both 

 heat absorbing and heat retaining. Lamps with tin chimneys were used at 

 first, but proved unsatisfactory. No. 2 lanterns and lamps were then 

 substituted. 



Briefly summarized, the work indicates in a general way that the heavier 

 processed fabric employed retains heat to an extent practicable for the pro- 

 tection of trees at a reasonable cost for fuel. The fabrics were not found 

 mildew resistant or gas and water tight as claimed. 



[Walnut growing in Arizona], J. J. Thoekbee {Arizona 8ta. Bpt. 1914, PP- 

 839, SJfO). — The author announces that C. R. Biederman, of Garces, Ariz., has 

 perfected a method of top-working Arizona walnut stocks which enables him 

 to graft French and English walnuts on Arizona stocks at almost any season 

 of the year. Several thousand native seedlings are to be grown in the plant 

 introduction garden for testing this method, which is to be fully described in 

 a publication soon to be issued by the station. 



Tree troubles at Douglas, Arizona, J. J. Thoenbee {Arizona 8ta. Rpt. 1914, 

 p. 34I). — Preliminary results from an examination into the causes affecting the 

 growth of ornamental trees and shrubs at Douglas, Ariz., indicate that some of 

 the more common troubles are bad drainage and soil aeration, due to poor 

 methods of planting, selection of varieties unsuited for local conditions, dam- 

 age to foliage from smelter smoke and fumes, and also black alkali in the 

 irrigation water. Lists are given of trees which do and do not grow well with 

 reasonable care both at Douglas and generally throughout the State. 



FORESTUY. 



Annual report on the progress, literature, and important happenings in 

 tlie realms of forestry, hunting, and fishing for the year 1913, H. Weber 

 {Allg. Forst u. Jagd Ztg., 1914, Sup., pp. VIII +216). — In continuation of pre- 

 vious reports (E. S. R., 30, p. 238), this supplement contains abstracts of the 

 more important world literature dealing with various phases of forestry, 

 together with notes on the principal occurrences relating to forestry, hunting, 

 and fishing during 1913. 



Pennsylvania trees, J. S. Iixick {Harrishurg : Pa. Dept. Forestry, 1914, PP- 

 231, pis. 164). — Part 1 of this work is intended for the layman and beginner of 

 forestry and comprises abstracts from the author's lectures on elementary 

 forestry at the Pennsylvania State Forest Academy. Part 2 is essentially a 

 manual of Pennsylvania trees. It comprises a discussion on the identification 

 of trees and a description of families, genera, and si:)ecies with accompanying 

 keys. 



The cypresses, A. Camus (Les Cypres. Paris: Paul Lechevalier, 1914, pp. 

 106, pis. 4, figs. 424)- — A monograph on the genus Cupressus. It comprises a 

 general account of the external and internal morphology of the genus, a study 

 of the stability of its characters, a classification of the genus, and descriptions 

 of the various species and varieties with reference to their bibliography, 

 synonymy, distinguishing characteristics, anatomy, habitat, geographical dis- 

 tribution, culture, and uses. A bibliography of cited literature is appended. 



[Eucalypt yields], A. M. McOmie {Arizona Sta. Rpt. 1914, p. 333). — ^A com- 

 parison of clean-cutting yields from a 12-year-old and a 6-year-old grove of 

 Eucalyptus rudis indicates that the increased number of ties, posts, and stove 

 wood secured to the older grove was not sufficient to warrant the delay of 

 six years in cutting. One hundred and thirteen 12-year-old trees yielded 10,175 



