EXPEEIMENT STATION EECOED. 321 



SOUS— FERTILIZERS. 



Soils, their properties and management, T. L. Lyon, E. O. Fippin, and 

 H. O. BucKMAN (New York: The MacmiUan Co., 1915, pp. XX/+7'6V,, pis. 2, 

 figs. 83). — This book deals more fully and in somewhat different order with 

 essentially the same subjects discussed in a previous book of the Rural Text- 

 book Series (E. S. R., 22, p. 519). Its purpose appears to be to bring the sub- 

 ject matter of the previous book up-to-date and to present in addition the 

 fundamental principles of recently developed phases of the study of soils. 



The formation, geological classification, and climatic and geochemical rela- 

 tionships of soils are first discussed. Subsequent sections take up the me- 

 chanical, physical, and chemical properties of soils in more or less detail, special 

 reference being made to soil colloids and the absorptive properties of soils. 

 Considerable space is devoted to soil moisture, its control, movement, and 

 utilization, and special sections cover drainage, irrigation, and dry farming. 

 Soil fertility with reference to natural stores of fertilizing constituents in soils 

 and the use of fertilizers and manures is also discussed, mainly from the 

 plant physiological standpoint. 



Soil conditions and plant growth, E. J. Russell (London: Longmans, 

 Green & Co., 1915, 3. ed., rev., pp. VII 1+190, figs. 11). — This represents a re- 

 vision and third edition of this book (E. S. R., 27, p. 821). A new chapter on 

 the relationship between the micro-organic population of the soil and the 

 growth of plants, and numerous sections dealing with recent developments of 

 other parts of the subject, have been added. 



The question of soil mapping, Reuss (Centbl. Gesam. Forstw., ^0- (1914), 

 No. 9-10, pp. 364-369). — As an improvement over the soil mapping scheme of 

 Graf zu Leiuingen (E. S. R., 32, p. 26), it is suggested that a soil map should 

 include geological and petrogi-aphic data, data as to the external condition and 

 physical, mechanical, and chemical properties of the soils, and data on soil 

 types with reference to crop adaptabilities. A general scheme for so present- 

 ing such data in usable form is briefly outlined. 



Field operations of the Bureau of Soils, 1912 (fourteenth report), M. 

 Whitney et al. (V. S. Dept. Agr., Field Operations Bur. Soils, 1912, pp. 2166, 

 pis. 35, figs. 56, maps 53). — This report contains a general review of the field 

 operations of the Bureau of Soils during 1912 by the chief of the Bureau, together 

 with detailed accounts of the following surveys : 



New London County, Conn., by W. E. McLendon; Orange C'"unty, N. Y., 

 by G. A. Crabb and T. M. Morrison ; Lehigh County, Pa., by W. T. Carter, jr., 

 and J. A. Kerr ; York County, Pa., by J. O. Yeatch, L. A. Hurst, and G. B. 

 Maynadier ; Reconnoissance Soil Survey of Southeastern Pennsylvania, by C. F. 

 Shaw, J. M. McKee, and W. G. Ross; Ashe County, N. C, by R. B. Hardison 

 and S. O. Perkins; Pender County, N. C, by W. E. Hearn, L. A. Hurst, R. B. 

 Hardison, L. L. Brinkley, and S. O. Perkins; Barnwell County, S. C, by W. T. 

 Carter, jr., R. T. Allen, J. E. Lapham, F. S. Bucher, and J. H. Agee; Chester 

 County, S. C, by W. E. McLendon and G. A. Crabb ; Ben Hill County, Ga., by 

 A. L. Higgins and D. D. Long; Chattooga County, Ga., by A. W. Mangum and 

 D. D. Long; Dougherty County, Ga., by M. E. Carr, H. Jennings, T. D. Rice, 

 and D. D. Long ; Troup County, Ga., by A. T. Sweet and H. C. Smith ; Recon- 

 noissance Soil Survey of Tattnall County, Ga., by H. H. Bennett; The Ocala 

 Area, Fla., by C. N. IMooney, W. J. Latimer, and H. and E. Gunter ; Clarke 

 County, Ala., by C. S. Waldrop, L. Cantrell, P. H. Avary, and N. E. Bell; 

 Conecuh County, Ala., by L. Cantrell, R. A. Winston, and F. W. Kolb; Cov- 

 ington County, Ala., by R. T. A. Burke, A, M. O'Neal, jr., W. E. Wilkinson, 



