No. 1, August. 1920] FORESTRY '.\.\ 



its own weight. — The rate of spread of iir ist measured by perimeter rather < ban by area 



or distance, and is governed largely by wind velocity. This speed varies as i be square <>f I he 

 wind velocity. — E. N. Munns. 



233. Skull, C. A. Curing timber. |Rev. of: Stone, Herbert. The ascent of the sap 

 and the drying of timber. Quart. Jour. Forest. 12 : 261-266. 191S.] Bot. Gaz. 68: 310. 1919. 



The author's suggestion may be sound on the practical side, but his "assumptions as to the 

 movement of sap in trees will not meet with favor among plant physiologists. It is hard to 

 imagine a conception more at variance with experimental results of physiological Btudii 



234. Sim, T. R. South African rubber. I. South African Jour. Indust. 2: 1127-1137. 

 5 pi. 1919. 



235. Sim, T. R. South African rubber. II. South African Jour. Indust. 3: 24-34. 1920. 



236. Society of American Foresters, Committee for the Application of Forestry. 

 Forest devastation: a national danger and a plan to meet it. Jour. Forest. 17:911-945. 1919.— 

 A detailed and comprehensive program of action is outlined. Blame is placed on the lumber 

 industry and economic development for the state of affairs at present. To correct the evils 

 which now exist, plans for constructive legislation are offered including the purchase and con- 

 trol of forest lands and production, the establishment of forest insurance agencies and forest 

 loan banks, and state cooperation in securing tax and fire-prevention reforms. A minority 

 report of the committee is also presented. — E. N. Munns. 



237. Startk, H. W. Reservation of standards in strips and checks in exploitation. In- 

 dian Forester 45: 414-416. 1 fig. 1919.— A system of parallel strips in cutting in coppice with 

 standards has been worked out to prevent the tendency towards overcutting, and frauds by 

 operators. — E. N. Munns. 



238. Stevens, J. L. Blackboy and its commercial uses. Australian Forest Jour. 2: 

 201-202. 1919. — The outside portions of the blackboy or grass tree are reported to yield very 

 fine drying oils and turpentine substitutes suitable for the manufacture of paints and var- 

 nishes. The acidic liquors obtained in the distillation process contain large quantities of 

 acetic acid, methyl alcohol and tannin extract, while the gas is of high calorific value and 

 purity, being free from sulphur and nitrogen compounds. — C. F. Korstian. 



239. Taylor, A. A. California's redwood park. Amer. Forestrv 25: 1446-1450. h fig. 

 1919. 



240. Tiemann, H. D. Kiln-drying specifications for airplane lumber. Sci. Amer. Sup- 

 plem. 88:104. S fig. 1919. 



241. Tragardh, Ivar. Nagra allmanna men bittills foga uppmarksammade barkborrar 

 och deras gangsystem. [Some common but hitherto little known bark beetles and their galler- 

 ies.] Skogen 6: 237-246. PL 1-7. 1919. 



242. Vernet, G. Precautions a prendre dans l'enfumage du caoutchouc (Incendies- 

 stickage). [Precautions to be taken in smoking rubber.] Bull. Agric. Inst. Sci. ^::igon 1: 

 362-36 1 . 1919. 



243. von Faxkhauser, F. Zur Kenntnis der Larche. [A larch study.] Schweiz. Zeit- 

 schr. Forstwesen 70: 188-191. .9 fig. 1919. — The natural range of the species is taken as the 

 area over which natural reproduction occurs, although good growth may be secured in other 

 regions by artificial reproduction. Soil moisture is emphasized as the principal factor that 

 limits the distribution of larch. Other writers have attributed depth and character of soil 

 as important limiting factors, but the occurrence of larch on all types of soil and its distrib- 

 tion, limited only bjr elevation and exposure, are taken as conclusive evidence that soil texture 



BOTANICAL ABSTRACTS, VOL. V, NO. 1 



