No. 1, October, 1 920 1 FORESTRY L3 



101. Marshall, Roy E., and F. D. Fromme. Red cedar trees and cedar rust: a report 

 of a cedar rust survey of Augusta county, Virginia. Virginia Polytechnic Inst. Ext. Bull. 39. 

 8 p. 1 fig. 1920.— See Bot. Absts. 4, Entry 1317. 



102. Mork-IIaxskn, K. C. H. Schroders udhugning i bog. [C. H. Schroder's thinning 

 system in beech forest.] Forst. Forsogsvasen Danmark 5: 150-178. PI. 1-2. 1920. — The 

 tables and discussion cover growth and recovery in three-storied beech forest in Denmark 

 after the Schroder method of thinning, which aims at producing straight, clear-holes trunks 

 from previously suppressed trees. The principle guiding the cutting may be summed up in 

 saying "Cut what is harmful and useless." The forester must know, however, how the trees 

 are going to respond, what space they need for best development, etc. After thinning, the 

 trees in the second story will help prune the upper, and those in the third story will help prune 

 those in the second story. — J. A. Larsen. 



103. Opperman, A. Sommerfalding i Bogeskov. [Summer-cutting in beech forest.] 

 Forst. Forsogsvasen Danmark 5: 180-192. 1920. — Beech cut in summer to be used for fuel 

 during the following winter showed insufficient drying. — J. A. Larsen. 



104. Robson, W. Bay trees (Pimenta acris). Rep. Agric. Dept. Montserrat 1917-18: 

 17. Imp. Dept. Agric. Barbados, 1919.— See Bot. Absts. 5, Entry 820. 



105. Rose, R. C. After-ripening and germination of seeds of Tilia, Sambucus and Rubus. 

 Bot. Gaz. 67: 281-309. 1919— See Bot. Absts. 4, Entry 1574. 



100. Rumbold, Caroline. The injection of chemicals into chestnut trees. Amer. Jour. 

 Bot. 7: 1-20. 7 fig. 1920.— See Bot. Absts. 5, Entry 964. 



107. Sabroe, Axel S. Skovtraer i det nordlige Japan. [Forest trees of northern Japan.] 

 Forst. Forsogsvasen Danmark 5: 105-155. PI. 2-28, 1 fig. 1920. — A report setting forth what 

 Japanese forest trees may be suitable for culture in Denmark. The forests of Japan have 

 been classified altitudinally into four zones: torrid, sub-tropical, temperate and frigid. Since 

 the climate in the temperate zone is more nearly like that of Denmark, only the trees in this 

 zone are considered. Much space is given to comparative data on temperature and precipi- 

 tation for different stations, and there are many excellent views and valuable information 

 concerning the trees; however, since the climate of Denmark is essentially continental and 

 that of Japan insular, little hope is expressed for the success of experimental introduction. 

 Cryptomeria japonica appears only where there is protection to the roots by deep snow; Pinus 

 thunbergii, which grows along the coast, may prove a better species in Denmark than Pinus 

 montana; Abies sachaliensis , Quercus dentata and Larix kurilensis should be tried on the Dan- 

 ish downs. Larix leptolepis is more immune from Sasyscypha willkommii than L. europaea. 

 The Japanese beech is not more promising than the European. Several smaller broadleaves, 

 among which are Acanthopanax ricinifolius , Cercidiphyllum japonicum, Quercus grosserata, 

 Fraxinus manshurica and Betula maximowiczii , are recommended for trial. — J. A. Larsen. 



108. Sargent, C. S. Notes on North American trees. V. Jour. Arnold Arboretum. 1: 

 61-65. July, 1919— See Bot. Absts. 4, Entry 1766. 



109. Sim, T. R. Soil erosion and conservation. South African Jour. Indust. 2: 1034- 

 1042. 1919— See Bot. Absts. 4, Entry 1635. 



110. Smythies, E. A. Geology and forest distribution. Indian Forester 45: 239-243. 

 1919. — There is a relation between geology and forest types which apparently so far has been 

 neglected in type studies. A plea is made for a closer study of geological formations in 

 connection with such work. — E. N. Munns. 



111. Troup, R. S. Experiments in the pollarding of Butea frondosa for lac cultivation. 

 Indian Forester 45: 223-233. PI. 14, 15. 1919. — Pollarding of Butea frondosa is possible 

 without seriously affecting the vitality of the trees, and the best results are obtained by pol- 



