542 EXPERIMENT STATION RECORD. [Vol.38 



exhausted of available moisture. The author points out that it requires com- 

 paratively little irrigation water to maintain available moisture in the deep 

 subsoil ; that an excess of water in the subsoil, when the drainage is poor, is 

 likely to result in root- rot; and that excessive water in a porous subsoil un- 

 doubtedly carries down nmch plant food beyond the reach of the feeding roots. 



Papaws, P. Watts (Imp. Dept. Agr. West Indies, Ilpt. Ayr, Dept. Montscrrat, 

 ]9I6~n. p. 25). — A brief account of preliminary work undertaken at the Mont- 

 serrat experiment station with a view to securing a type of papaw with a high 

 papain content. 



Proper place of nut trees in the planting program, C. A. Reed (Amer. Nut 

 Jour., 8 (191S), Nos. 1, p. 5; 2, pp. 20, 21). — The author briefly discusses the 

 climatic limitations of cultivated and native nut species in the United States, 

 calls attention to the lack of nut varieties for the section of country east of 

 the Rocky IMountains and north of the pecan belt, and advocates the extensive 

 planting of seedling nut trees along the national highways as a means of 

 furnishing ample material from which to select improved varieties for orchard 

 planting. 



Bay trees (Pimenta acris), F. Watts {Imp. Dept. Agr. West Indies, Rpt. Agr. 

 Dept. Montserrat, 1916-17, pp. 15-18). — Data are given on cultural experiments 

 with bay trees during the year ended March 31, 1917, with special reference to 

 tlie yield in leaves and actual amount of oil distilled. Comparative data are 

 given for the years 1912 to 1916, inclusive. 



The soil of Netherlands Indies and its use in agriculture {Verxamel. Ver- 

 handel. Grand Nedcrland. Indie Gcbruik Landb., Bodemcong. Djokjokarta, 1916, 

 Nos. S, pp. 4, pis. 12; 6, pp. 4; 8, pp. 4; 13, pp. 5; 14, pp. 3; 15, pp. 20; 16, pp. 

 14; 17, pp. 19, pis. 3; 18, pp. 7). — Among the papers on the above subject pre- 

 sented at the Netherlands Indies Soil Congress, held at Djokjokarta in October, 

 1916, are the following: The Principles of Cinchona Culture (No. 3), by P. Van 

 Leersum, previously noted from another source (E. S. R., 36, p. 538) ; Principles 

 of Coconut Culture (No. 6), by P. E. Keuchenius; The Knowledge Relative to 

 the Manuring of Perennial Cultures (No. 8), by A. J. Ultee; A Short Descrip- 

 tion of the Usual Methods of Preparation for Planting and Subsequent Man- 

 agement of Hevea Trees (No. 13), by C. M. Hamaker ; The Principles of Coffee 

 Culture (No. 14), by T. W^urth ; Soil in Relation to the Forests (No. 15), by 

 H. Beekman ; Coffee Culture in the Residencies of Pasoeroeau and Kediri (No. 

 16), by M. W. Senstius; Green Manuring (No. 17), by C. Bernard, previously 

 noted from another source (E. S. R., 38, p. 20) ; and Notes on the Tea Soils of 

 Java and Sumatra (No. 18), by J. J. B. Deuss. 



Rliododendrons and the various hybrids, J. G. Millais (London and Neio 

 York: Longmans, Green & Co., 1917, pp. XI +268, pis. 61). — A descriptive ac- 

 count of all species of the genus Rhododendron, including azaleas, and the 

 various hybrids. The work is well illustrated with colored and collotype 

 plates, together with numerous illustrations from photographs. 



The introductory chapter discusses the love of gardening and gardens, with 

 special reference to rhododendrons. The succeeding chapters deal with the 

 general distribution of the species, Chinese rhododendrons, liybrid rhododen- 

 drons, cultivation, rhododendrons for each month of the year, and gardens 

 where rhododendrons are a special feature. The work concludes with an 

 alphabetical list of all known rhododendrons and their hybrids, with descrip- 

 tions of all those which are generally cultivated and notes on their cultivation, 

 history, and geographical distribution. 



An introduction to the study of landscape design, H. V. Hubbakd and 

 Theodoka Kimball (New York: The MacmiUan Co., 1917, pp. XX +406, pis. 72, 

 figs. 11). — The purpose of this work is to present a general conception of land- 



