194 FORESTRY [BoT. Absts., Vol. IX, 



1251. KoBATASHi, J, Paper making in Japan. Amer. Forestry 27: 320-321. 2 jig. 1921. 



1252. KtJNKELE. Hilfstafel zur Zuwachserhebung. [Graphic chart for determining incre- 

 ment.] Forstwiss. Centralbl. 43:81-83. Chart 1. 1921. — A chart giving the per cent of incre- 

 ment of basal area, height, volume, and value of individual trees, is illustrated and discussed 

 briefly. The determination of growth per cent of individual trees is particularly important 

 now that silviculture is turning strongly toward the selection system. — W. N. Sparhawk. 



1253. KuRTH. Fichtensaat oder -pfianzung? [Spruce seeding or planting?] Deutsch. 

 Forstzeitg. 36: 147. 1921. — Spruce stands grown from plantations do not, because of compara- 

 tively wide spacing, produce long slender poles, especially bean poles, which are in great 

 demand. Therefore about 10 per cent of the area restocked with spruce each year should be 

 seeded instead of planted. — W. N. Sparhawk. 



12.54. L. [Rev. of: Achtekrath, Helmut. Deutsche Rohholzwirtschaft wahrend des 

 Krieges und in der Ubergangszeit. (German timber supply during the war and in the transition 

 period.) Frankfort.] Forstwiss Centralbl. 43: 29-30. 1921. — Achterrath discusses the tim- 

 ber situation before the war, measures adopted to insure supplies for the army and civil use 

 during the war, and the outlook for the future, with especial reference to future sources of 

 imports. — IF. A''. Sparhawk. 



1255. LoNGViLLE, A. Logging by electricity. Sci. Amer. 124: 285. 2 fig. 1921. 



1256. Mahood, S. A., andEloiseGerry. The production of American storax. Druggists 

 Circ. 65: 3-5. Fig. 1-7. 1921. — Experiments were carried on to find a supply of storax to 

 take the place of Asiatic storax which was shut off by the World War. Collections of material 

 fpr investigation were made from Liquidambar styraciflua growing near Elliott City, 

 Louisiana, from June 10 to Nov. 14. Methods of tapping the trees and collecting the gum are 

 described. Chemical analyses show that American storax compares very favorably with that 

 of Asiatic origin. A microscopic examination of the wood shows that the storax is produced 

 in the wood formed after the tree has been wounded. The yield of storax is in proportion to 

 the number and size of the ducts thus developed. — C. M. Sterling. 



1257. Miller, E. E. Black locust reclaims washed lands. Amer. Forestry 27: 252-253, 

 264. 4 fig. 1921. 



1258. Munch, Ernst. Naturwissenschaftliche Grundlagen der Kiefernharznutzung. 

 [Scientific bases of production of pine resin.] Arbeit. Biol. Reichsanstalt Land- u. Forstw. 

 10: 1-140. 20 fig. 1919. — The scarcity of naval stores in Germany during the war led to the 

 utilization of the resin of Pinus sylvestris as a new industry, Miinch attempts to place the 

 technique of tapping on a scientific basis. The careful study comprises the following points: 

 Microscopic structure of the resin duct; distribution and number of ducts with relation to 

 width of annual ring; structure of the system of ducts throughout the bole; physiology and 

 mechanics of the formation and flow of resin upon tapping; formation and role of pathological 

 ducts; influence of climate, site, age, crown development of tree, method of tapping, and 

 intervals between tapping on yield. The yield may vary up to 400 per cent. The possible 

 yield per hectare per year is 1000-1250 kgr. — E. P. Meinecke. 



1259. Neumann. Die Kief er-Dauerwaldwirtschaft. [The continuous management system 

 with pine.] Deutsch. Forstzeitg. 36: 189-193. 1921. — The author has visited the Barenthorn 

 forest in Anhalt, where von Kalitsch has developed an original and highly successful method 

 of silviculture. Stands are thinned every year, sometimes twice a year, beginning at 25 or 

 30 years of age, until about 10 seed trees per hectare are left. Logs are dragged out by horses, 

 so as to loosen the soil and favor reproduction ; because of the density of the latter, it does not 

 matter that some seedlings are destroyed in removing the seed trees. All leaf litter and twigs 

 are left on the ground to protect and enrich the soil. This method has resulted in most 



