No. 2, November, 1920] FORESTRY 89 



635. Whitford, H. N. [Rev. of: Brown, W. H., and A. I\ Fisher. Philippine man- 

 grove forest. Philippine [slands Bur. Forest. Hull. 17. i.i.i p., 47 pi. Manila, 1919.] Jour. 

 Forestry 18: 166-167. 1920. 



636. Whitford, !I. N. [Rev. of: Skottsbbro, Carl V. Die Vegetationsverhaltnlsse 

 langs der Cordillera de los Andes S. von 41° S. Br. : Ein Beitrag zur Kenntnis der Vegetation in 

 Chiloe, West-Patagonien, den Andinen, Patagonien und Feuerland. Botanische Ergebnisse 

 der Schwedischen Expedition nach Patagonien und dem Feuerlande 1907 1909. (Vegetation 

 of the Andean Cordillera south of 41° South Lat., Chile, Patagonia and Tierra del Fuego. Botan- 

 ical results of the Swedish expedition of 1907-09.) 366 p. Stockholm, 1916.] Jour. Forestry 

 18: 161-165. 1920. 



637. Wilson, Ellwood. The use of aircraft in forestry. Amer. Forestry 26: 326-328. 

 4 fig. 1920. 



638. Wimbush, A. Big teak in Madras. Indian Forester 46: 247-249. 1 pi. 1920 — 

 An average volume of 317 cubic feet per tree was obtained from 111 teak trees, the maximum 

 yield from one tree being 1,099 cubic feet. — E. N. Munns. 



639. Wolff, M. H. Plan of relation of forest regulation to forest communities. Jour. 

 Forestry 18: 4S6-497. 1920.— The Coeur d'Alene National Forest (northwestern United 

 States) can best be handled under a system of volume regulation with a sustained annual 

 yield. With small working circles, the development and maintenance of local logging com- 

 munities is assured. Dividing the forest into six areas, it is possible to develop the plan 

 equally by pairing off the stands of poorer and relatively inaccessible material with the more 

 accessible and high quality stands. The volume cut up to the present shows an apparent over 

 cutting, but this is due to under-estimates of the stand, very conservative estimates of growth, 

 and cutting in non-marketable blocks. It is expected that the annual yield figures of from 

 seventeen to twenty million feet will vary greatly from year to year depending on transport, 

 seasonal variations, logging fluctuations, and the cut from private lands outside the Forest. 

 By maintaining this cut at a constant, the population depending on the industry will largely 

 be stabilized and the communities assured. — E. N. Munns. 



640. Wood, Leslie S. The Mapledurham statistics. Quart. Jour. Forest. 14: 49-59. 

 1920. — Yearly diameter measurements of sample areas in several tracts of beech woodland 

 situated in South Oxfordshire, England, and actual volume measurements of trees felled in 

 these woods, disclose some interesting variations in volume related to the density of the 

 crop. In dense woods, due to increased height growth, the average cubic contents of trees 

 of equal diameters is higher than in woods where the trees are widely spaced. The mean 

 increment for a 7-year period for seven pieces of woodland varied from 1.81 per cent to 5.4 

 per cent and averaged 2.8 per cent. The increment of 1.81 per cent is for woodland where the 

 trees stood too close and that of 5.4 per cent is for one where did they not stand close enough. 

 The total increment per acre was not as large in either case as would have been secured through 

 more judicious spacing. Trees 20 inches or less in circumference show a mean annual incre- 

 ment of 1.5 per cent as compared to 2.44 per cent for those over 20 inches in circumference. 

 The smaller trees owe their slow growth partly to being suppressed and partly to being old 

 stock and consequently slow growers. These figures favor the compartment system in beech 

 woods, for under that system all the suppressed and slow-growing trees are removed and the 

 best-growing trees are encouraged; the removal of the small trees automatically raises the 

 percentage of growth of the larger trees. — C. R. Tillotson. 



641. Woodbury, T. D. California forests and forestry. Amer. Forestry 26: 262-267. 8 

 fig. 1920. 



642. Woolsey, Theodore S., Jr. Fire protection in Portugal. Jour. Forestry 18: 542- 

 543. 1920.— The methods employed by the government, on a forest of 2S,066 acres, are 

 described. — E. M. Munns. 



