No. 3, July, 1921] FORESTRY 265 



used and in the second it is left. Volume growth on the 2 areas is as 1 is to 2.5, the quality 

 coefficient as 1 is to 1.5. Litter is deficient in potash and phosphorus and makes a poor 

 fertilizer for agriculture; its highest value is realized in the forest. — F. S. Baker. 



1872. Record, S. J. Scented woods. Amer. Forestry 26: 665-672. 20 fig. 1920.— A 

 popular description of various odoriferous woods. — Chas. H. Otis. 



1873. Reisner, J. H. Progress of forestry in China. Amer. Forestry 26: 655-€58. 5 

 fig, 1920. 



1874. Rettmeyer. Zum Windmantel 5 des Forstgesetzes. [Windbelts, section 5 of the 

 forest laws.] Wiener Allg. Forst- u. Jagd-Zeitg. 38: 249-250. 1920.— A discussion of the 

 meaning of the law and its practical application under different conditions. — F. S. Baker. 



1875. Rowe, M. H. Mixed woods. Quart. Jour. Forest. 14: 171-176. 1920.— A silvicul- 

 tural discussion of the advantages and disadvantages of mixed woods with suggestions as to 

 desirable and undesirable species in mixture. The point is made that the safest and at the 

 same time most easily managed system of mixing is by groups which are planted pure. Groups 

 of shade-bearing species should be at least 5 acre in size, more if possible; groups of light 

 demanders should never exceed 5 acre in extent, preferably \ acre. There is a good reason 

 for small groups of light-demanding trees. After the thicket stage is past, the characteristic 

 opening out inevitably ensues, thus permitting soil deterioration. — C. R. Tillotson. 



1876. Siecke, E. 0., and L. Wyman. Forestry questions and answers. Texas Agric. 

 Exp. Sta. Forest. Bull. 12. 15p. 1920. — This bulletin consists of general questions and answers 

 as to present areas and conditions of Texas forests and other forestry problems of an elemen- 

 tary nature. One map shows the forested areas and type of forest in each; another divides 

 the state into 5 tree-planting districts and lists trees suitable for each. — L. Pace. 



1877. Sim, T. R. Pine tree culture in South Africa. A summary of the results of practical 

 experiences. South African Jour. Indust. 4: 65-75. 1921. 



1878. Sim, T. R. Timber trees for commercial culture. Species that have been tried in 

 South Africa. South African Jour. Indust. 3: 1030-1039. 1920. 



1879. Sim, T. R. Timber trees for South Africa. Eucalypts and others considered in 

 detail. South African Jour. Indust. 3: 1155-1172. 1920. 



1880. SissoN, G. W., Jr. The pulp and paper industry. Amer. Forestry 26: 687-688. 

 1920. — [Extracts from an address at the New England Forestry Conference, Aug., 1920.] 



1881. Slavik, Victor. Die Nonne. [The nun moth (Liparis monacha).] Allg. Forst- 

 u. Jagd-Zeitg. [Wien] 38: 96-99, 110-111. 1920.— A full discussion of methods in vogue for 

 discovering and destroying the nun moth, including the collection of caterpillars on standing 

 and felled trees, destruction of eggs and general management of affected stands. Thinnings 

 between April and August should not be carried on in affected forests. Fifteen points are 

 enumerated in conclusion bearing on control of the nun, ranging from direct destruction to 

 indirect educational means. — F. S. Baker. 



1882. Smythies, E. A. Afforestation of ravine lands in the Etawah District, United Prov- 

 inces. Indian Forest Rec. 7*: 1-32. PI. 1-34- 1920. — Deforestation and over-grazing are 

 responsible for severe ravine erosion in all stream beds in the Gangetic plain where the popula- 

 tion is dense. To check the erosion, it is proposed to reduce the velocity of the water by means 

 of small dams and to improve the soil cover at the head of ravines. In the filled-in basins 

 behind the dams trees are planted which make an excellent growth. On steep slopes, small 

 contour terraces are made to prevent soil wash, to collect and store water, and to furnish 

 places for seed and tree planting. The work is to be carried on as a measure of famine relief; 

 and as labor at that time is cheap and plentiful, the work can be done at small cost, while 

 the government receives a benefit from the famine relief. — E. N . Munns. 



