1920] EXPERIMENT STATION RECORD. 343 



FORESTRY. 



Principles of a new plulosophy of forestry, H. Wkijer (Clnindlinicn eincr 

 nciiCH Forstuirtschaflsijliilo.soijhic. Tiihiiu/cn: 11. lAiitpi), lUli), pp. J/l-\-JJ6, 

 fil/.f. 2). — A criticjil analysis of the science of forestry in part 1 of wliicli con- 

 sidi'ratioii is jjiven to tlio fundamental princii)lcs. Part 2 discusses the sys- 

 tematic arranjj;enient, and part 3 the nu'thodology of forestry science. 



Elements of silviculture, I, II, F. E. G. D'Ai.vikli.a (Elements de Hylvicul- 

 turr. Paris: Miircel Ririrrc, 1919, vols. 1, pp. XIV-\-38S, pis. 2, fuis. SJ, ; 2, pp. 

 269. pi. U fiffS- 33). — An elementary treatise of silvicultiu-al practice prt'iian-d 

 with special reference to the reforestation of the devastated woodlands in I'.el- 

 piuin. In the tirst section are given descriptions of coniferous and deciduous 

 species adapted to that country. The succeeding sections discuss the tree in its 

 relation to such natural agents as liglit, temperature, meteorological phenomena, 

 climate, soil, etc. ; preparation of woodland soils, nursery practices, and plant- 

 ing and cultural oi>erations; and various causes of damage to w'oodlands, lop- 

 ping, exploitation, management, and trees in relation to the law. 



A list of the principal works consulted is appended. 



Economic aspects of State forests, W. Compton (Chiccif/o: Xatl. Luuihvr 

 Mtinfrs. .Issoc, Bur. Econ., 1920, pp. 19). — A paper delivered befon^ the Tri- 

 State Forestry Conference (Ohio, Indiana, Illinois) at Indianapolis, Ind., Octo- 

 ber 22, 1919. 



Conservation: The form or the substance: Which? W. Compton {Chicago: 

 Natl. Lumber Manufrs. Assoc, Bur. Econ., 1919, pp. 24). — A discussion of for- 

 est conservation more particularly from the lumbermen's point of view. 



Forestry in the Douglas fir region, T. T. Mungeb {A)ner. Forestry, 26 

 {1920), Xo. 316, pp. 199-205, /if/s. 7).— The author reviews the present status of 

 lumbering in the Douglas tir region, and presents suggestions relative to a pro- 

 gram for the reafforestation of the cut-over lands. 



Sixteenth annual rejjort of the State forester [of 3Iassachusetts], V. W. 



Rank {Ann. Rpt. State Forester Mass., 16 {1919), pp. 61, pis. 5).— This is tlie 



u.sual annual report relative to activities on the State forests and nurseries in 



^ Massachusetts, including accounts of general reforestation activities in the 



■State and blister-rust, moth, and control work, together with recommendations 



relative to needed legislation. 



Influence of sodium chlorid upon the physiological changes of living 

 trees, \V. Ruuoi.ys (.So// Sci., 8 {1919), Xo. 5, pp. 397-425, fif/s. ;.7).— This paper, 

 a cttntribution from Ilutgers College, reports experiments made upon 100 trees 

 with sodium chlorid, applications to the soil ranging from 1 to 10 lbs. to indi- 

 vidual trees. 



" Some trees .showed injury as early as G weeks after the application, while 

 after 10 weeks a numl)or of trees were seriously injured and some dying. The 

 leaves of these trees turned brown and curled. An exannnation made at the 

 , height of the season showed some marked external changes. Smaller applica- 

 tions of salt apparently acted as a fertilizer. The trees treated with a small 

 application were making a vigorous growth, the leaves becoming very large and 

 thick, having a dark blue-green color and glcssy surface. Others elongated their 

 branches making the distance between the leaves luiusually wide. The fii'st 

 signs of toxicity appeared usually at the edges of the leaves at the extreme end 

 of the tracheids, or in the primary and secondary veins. The injury spread 

 gradually until the leaves had a spotted, sickly appearance. After some time 

 the l('av«>s dried (mt with a rubberlike consistency. These leaves kept their Hat 

 and glossy sui'face and dropped fr(jm the branches. If the injury started at the 



