248 EXPERIMENT STATION RECORD. [Vol. 38 



Note on the cubage of a sample plat in the virgin forest of Yangambi, 

 central Kongo, E. T.ki'lae (/}»/. Ayr. Congo Beige. 8 (1917), No. 1-2, pp. 89-98, 

 pi. 1. fig. 1). — Height, circuniferonce, and volinne data are given for the stand- 

 ing crop on ahout five acres of foi-est, including over 50 different species. 



A new dendrometer, 1). Bruce {Univ. Cal. Pubs. Agr. Set., 3 {WIT), No. i, 

 pp. 55-61, figs. 3). — Tlic dendrometer here illustrated and described consists 

 essentially of a straight arm upon which are mounted two small mirrors, both 

 at an angle of 45° with the axis of the arm, parallel to each other and facing 

 in opposite directions. One mirror is fixed at one end of the arm, while the 

 other is mounted on a slide which travels along the arm. Graduations permit 

 a direct reading of the distance between the mirrors. 



Emergency fuel from the farm woodland, A. F. Hawes {U. S. Dept. Agr., 

 Office Sec. Circ. 79 {1917), pp. S). — This circular discusses the necessity of sup- 

 plementing the coal supply witli wood, the relative heating value of wood and 

 coal, methods of making cordwood, wood as a profitable farm crop, opportunity 

 to improve the woodland, and connnunity action regarding wood supply. 



The substitution of other materials for wood. — Studies of the lumber in- 

 dustry, XI, R. Thelen (C7. S. Dept. Agr. Rpt. 117 (1917), pp. 78, figs. 28).— 

 This report, which was prepared under the direction of the Forest Service, 

 comprises a compilation of all the data obtainable, even if not wholly complete 

 or exact, on the replacement of lumber and wood in other forms. The report 

 covers substitution in thirty or more forms of use, and conclusions and sug- 

 gestions relative to substitution are presented. 



Tanning materials from native sources in Latin-American countries, T. H. 

 Norton (Proc. 2. Pan Amcr. Sci. Cong., 1015-16, vol. 8, pp. 130-153, pis. 2, fig. 

 1). — A paper presented at the Second Pan American Scientific Congress, held 

 at Washington, D. C, December 27, 1915, to January 8, 1916, in which the author 

 describes the occurrences of tannins in such woods, barks, leaves, excrescences, 

 roots and bulbs, and fruits and seeds of the Latin-American flora as are actually 

 or potentially of importance among the world's sources of tanning materials. 



DyestufEs from materials native to Latin- American countries, S. P. Sadtleb 

 (Proc. 2. Pan Amer. Sci. Cong., 1915-16, vol. S, pp. 153-162). — In this paper, 

 read before the Second Pan American Scientific Congress, held at Washington, 

 D. C, December 27, 1915, to January 8, 191G, the author briefly discusses the 

 extraction of dyes from vegetable and animal sources, such as dyewoods and 

 certain color-yielding insects, as compared with the nianufactui'e of the syn- 

 thetic or coal-tar dyes. The important dyewoods and dye-yielding plants of 

 Latin-American countries are enumerated. 



Seasoning of wood, J. B. Wagner (Nctv York: D. Van Nostrand Co., 1917, 

 pp. XIII-\-274, pl- 1, fios. 100). — A treatise on the natural and artificial proc- 

 esses employed in the preparation of lumber for manufacture, with detailed 

 explanations of its uses, characteristics, and properties. 



The preservation of shingles {Pennsylvania Sta. Bill. l-'f7 {1917), p. 38). — 

 No difference was observed in the lasting qualities of redwood, red cedar, and 

 chestnut shingles and creosoted shingles of chestnut, southern yellow pine, and 

 pitch pine after being laid nine years. Creosote treatment cost about 50 cts. 

 per bundle. 



Chestnut fence posts creosoted and set were found in good condition after 

 ten years, while check posts were badly rotted. 



Zinc chlorid as a preservative of structural timber, C. M. Spofford {Trans. 

 Nat. Assoc. Cotton Manfrs., No. 102 {1917), pp. 236-2^1) .—In this paper the 

 author presents the results secured in a series of tests conducted during the 

 last three years in the laboratories of the Massachusetts Institute of Tech- 

 nology, to determine the effect of the zinc chlorid or Burnettizing process of 



