No. 4, January, 1921] FORESTRY 227 



1534. Anonymous. Timber depletion and the answer. A summary of the report on tim- 

 ber depletion and related subjects prepared in response to senate resolution 311. U. S. Dept. 

 Agric. Dept. Circ. 112. Id p. 1920. — Discussion of forest resources of the United States, 

 yesterday and today, and suggestions for a national forest policy which is needed to meet the 

 timber depletion situation. — L. R. Healer. 



1535. Bartlett, H. H. The manufacture of sugar from Arenga saccharifera in Asahan, 

 on the east coast of Sumatra. Michigan Acad. Sci. Ann. Kept. 21: 155-165. PL 8-6. 1919. — 

 See Bot. Absts. 6, Entry 1892. 



1536. Betts, II. S. How lumber is graded. U. S. Dept. Agric. Dept. Circ. 64. 39 p., 

 9 fig. 1920. — A discussion and explanation of hardwood and softwood lumber grading, 

 accompanied by descriptions of typical rules. — L. R. Hesler. 



1537. Carlson, K. A. The growing of mine props on the High Veld. Jour. Dept. Agric. 

 Union of South Africa 1: 261-270. 1920. — A low grade quality of timber can be used for mine 

 props, and advantage is taken of this circumstance to plant the most rapidly growing species 

 which supply a timber of sufficient strength. To meet these requirements the principal species 

 used are Eticalyphis viminalis, E. rostrala, E. Maidenii, E. globulus and E. sideroxylon ; 

 sylvicultural notes are given on each of these species. The cost of planting and maintenance 

 is discussed, and it is stated that there are undoubtedly good prospects for afforestation con- 

 ducted on sound lines. — E. M. Doidge. 



1538. Clinton, G. P., and Florence A. McCormick. Infection experiments of Pinus 

 strobus with Cronartium ribicola. Connecticut (New Haven) Agric. Exp. Sta. Bull. 214: 

 428-459. PI. 37-43. 1916-1918— See Bot. Absts. 6, Entry 225. 



1539. Crevost, C, and C. Lemarie. Plantes et produits filamenteux et textiles de 

 l'Indochine. [Fiber- and textile-producing plants of Indo-China.] Bull. Econ. Indochine 

 22: 675-709. 19 pi. 1919. Ibid. 23: 45-71. 4 pi. 1920.— This is another contribution to 

 this series covering in detail chiefly the bast-fiber producing plants of the Leguminosae, 

 Malvaceae, Tiliaceae, Sterculiaceae, and Linaceae, as well as those fibers especially adapted 

 for the manufacture of cordage, and for the manufacture of paper. — E. D. Merrill. 



1540. Dixon, Henry H. Mahogany and the recognition of some of the different kinds by 

 their microscopic characters. Sci. Proc. Roy. Dublin Soc. 15:431-486. 22 pi. 1918. — See 

 Bot. Absts. 6, Entry 385. 



1541. Doyle, Joseph. Observations on the morphology of Larix leptolepsis. Sci. Proc. 

 Roy. Dublin Soc. 15: 310-327. * pi. 1918.— See Bot. Absts. 6, Entry 386. 



1542. Harvey, LeRoy H. Some phytogeographical observations in Lake County, Michigan. 

 Michigan Acad. Sci. Ann. Rept. 21 : 213-217. 1919. 



1543. Haslund, Ove. Skogvardierne. [Forest valuation and taxation.] Tidsskr. Skog- 

 bruk 28: 120-123. 1920. 



1544. Henry, Augustine, and Margaret G. Flood. The Douglas firs: a botanical and 

 silvicultural study of the various species of Pseudotsuga. Proc. Roy. Irish Acad. B, 35: 67-90. 

 PI. 12-14. 1920. — The genus Pseudotsuga is divided into seven species and one variety as 

 follows: (1) P. douglasii (Carriere) (laxifolia Britton), Pacific coast of North Amer. ; P. 

 douglasii var. caesia (Schwerin), northern Rocky Mts. ; (2) P. glauca (Mayr), Rocky Mts., 

 Colorado and Mexico; (3) P. macrocarpa (Mayr), southern California; (4) P. japonica 

 (Beissner), Japan; (5) P. sinensis (Dode),. N. E. Yunnan, China; (6) P. forrestii (Craib.), 

 W. Yunnan, China; (7) P. wilsoniana (Hayata), Formosa. — Botanical characteristics, range, 

 and size of each spec es are given, followed by detailed discussion of silvical and botanical 

 differences between the Oregon and Colorado species. Measurements of the two species in 



