No. 1, May, 1921] FORESTRY 19 



revohita, Pinus luchuensis, and two x^alms. The flora contains according to our present 

 knowledce 351 species and 23 varieties representing 233 genera; a considerable number of the 

 species and most of the varieties are endemic. A systematic enumeration of the woody 

 plants concludes the article and contains a new species, a new variety, and a new combina- 

 tion: Elaeagnus liukiuensis Rehd., Rhamnus davuricus var. liukiuensis Wils., and Zanthoxylon 

 okinawetisis (Nakai) Wils. A list of the woody plants of the Kawanabee Islands, which con- 

 nect Japan and the Liukiu Islands, compiled by Ushiwo is appended. — Alfred Rehder. 



APPLIED ECOLOGY 



147. Naumann, Einar. Tillampad limnologi. Nagra teoretiska grundlinjer for en ration- 

 ell vattenkultur. [Applied limnology. Some theoretical principles of a rational water culture.] 

 K. Landtbr. Akad. Handl. och Tidskr. 58: 199-221. 1919. — A discussion of plankton in rela- 

 tion to environmental conditions, methods of improvement, and utilization as fish food. — 

 E. G. Anderson. 



FORESTRY AND FOREST BOTANY 



Raphael Zon, Editor 

 J. V. HoFMANN, Assistant Editor 



(See also in this issue Entries 48, 82, 86, 89, 422, 505, 572, 576, 688) 



148. Anonymous. Distillation of sandal oil. Australian Forest. Jour. 3: 316-318. 1920. 

 — A note on the recently developed sandalwood oil industry in Western Australia. — C. F. 

 Korstian. 



149. Anonymous. Forest trails and highways of the Mount Hood region, Oregon National 

 Forest, Oregon. U. S. Dept. Agric. Dept. Circ. 105. 32 p., ilius. 1920. 



150. Anonymous. Ironbark versus jarrah. Australian Forest. Jour. 3:239. 1920. — A 

 note on a test conducted by Warrex of Sydney University to determine the comparative 

 strengths of New South Wales Eucalyptus paniculata and E. marginata. As a result of a 

 simple cross breaking test the former (iron-bark) proved the stronger of the 2 species. — 

 C. F. Korstian. 



151. Anonymous. A mountain vacation land. U. S. Dept. Agric. Dept. Circ. 1.32. 10 p., 

 ilhis. 1920. 



152. Anonymous. A new textile from the bark of the "silkworm mulberry." Sci. Amer. 

 Monthly 2: 152. 1920. 



153. Anonymous. Snobrott och toprota has granen. [Snow breakage and top rot in 

 spruce.] Skogsv&rds Foreningens Tidskr. 17: 173x-181x. 1919. — The article reports a discus- 

 sion by Swedish foresters of an address on the above subject by T. Lagerberg at the annual 

 meeting of the association, March 15, 1919. — G. A. Pearson. 



154. Anonymous. A thinning area re-visited. Australian Forest. Jour. 3 : 251-254. 1920. 

 — A brief discussion of the failure of the seedling crop in rather heavily thinned stands of 

 Eucalyptus, which is attributed to: (1) Heavy grazing and rabbit injury in dry years, the 

 latter being the principal cause of the damage, leaving the forest dependent on coppice for 

 regeneration; (2) removing all mature standards and not leaving seed trees, the immature 

 standards being too young to produce seed; and (3) the absence of humus, which is regarded 

 as a minor cause. — C. F. Korstian. 



