1917] SOILS FERTILIZERS. " 721 



Reconnoissance soil survey of the San Francisco Bay region, California, 

 L. C. Holmes and J. W. jXelson (U. S. Dept. Agr., Advance Sheets Field Opera- 

 tions Bur. Soils, 191Jf, pp. 112, pis. 4> fiff- 1, "'op -^)- — This survey, made in co- 

 operation with the California Experiment Station, deals with the soils of an 

 area of 2,517,120 acres in western California. " Topographically the area em- 

 braces a series of elongated valleys, separated by high hills or mountains, all 

 extending in a general northwest-southeast direction. The valleys are some- 

 what irregular in outline and range in extent from a few square miles to about 

 200 square miles. They are usually well drained and consist of nearly level 

 to very gently sloping surfaces with occasional minor stream bottoms." 



" The soils of the valleys are principally recent alluvial soils. . . . Those of 

 the hills and mountains are mainly residual and vary with the character of 

 the underlying rocks. Much of the high mountainous area is too rough and 

 broken for agriculture." 



Forty-three soil types are mapped, of which the Altamont loam and clay 

 loam and the Altamont, Mariposa, and Sites loams and clay loams cover 20.9 

 and 20.1 per cent of the area, respectively. 



Soil survey of Grant County, Indiana, L. A. Hxjbst, W. I. Watkins, W. E. 

 Thabp, E. Hertenstein, and P. Middleton (U. S. Dept. Agr., Advance Sheets 

 Field Operations Bur. Soils, 1915, pp. 36, fig. 1, map 1). — This survey, made 

 in cooperation vrith the Indiana Department of Geology, deals with the soils 

 of an area of 263,680 acres in northeast central Indiana, which consists of a 

 level to undulating plain broken only along the streams. "Artificial drainage 

 has been installed extensively in the more poorly drained sections of the 

 county." 



In addition to muck and peat, nine soil types of six series are mapped, of 

 which the Clyde silty clay loam, Crosby silt loam, Miami silty clay loam, and 

 Miami silt loam cover 34, 20.3, 18.5, and 14.5 per cent of the area, respectively. 



Soil survey of Starke County, Indiana, E. J. Gkimes, W. Barrett, and T. M. 

 BusHNELL (f7. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1915, 

 pp. 42, fig. 1, map 1). — This survey, made in cooperation with the Indiana De- 

 partment of Geology, deals with the soils of an area of 197,120 acres in north- 

 western Indiana, the topography of which is very flat except for scattered dune- 

 like ridges and Irregular areas of sand. " The county lies almost entirely 

 within the Kankakee plain. . . . Practically all the flat lands throughout the 

 county originally were poorly drained. ... A large total area is yet unre- 

 claimed." 



Including muck, 10 soil types of 6 series are mapped of which the Plainfield 

 fine sand, Clyde fine sand, Clyde fine sandy loam, and muck cover 31, 17.4, 

 17.1, and 16.7 per cent of the area, respectively. 



Soil survey of Sioux County, Iowa, E. H. Smies and W. C. Bean (C7. 8. 

 Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1915, pp. 37, fig. 1, 

 map 1). — This survey, made in cooperation with the Iowa Experiment Station, 

 deals with the soils of an area of 489,600 acres in northwestern Iowa, the topog- 

 raphy of which varies from undulating to sharply rolling. The surface is that 

 of a broad loessial plain. Drainage is well established. The soils are grouped 

 as loessial, glacial, terrace, and first bottom soils. 



Excluding river wash and rough broken land, 9 soil types of 6 series are 

 mapped, of which the Marshall silt loam covers 80.8 per cent of the area. 



Soil survey of Ripley County, Missouri, P. Z. Hxjtton and H. Kbusekopf 

 {V. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1915, pp. S6, 

 fig. 1, map 1). — This survey, made in cooperation with the Missouri Experiment 

 Station, deals with the soils of an area of 399,360 acres in southeastern Missouri, 

 lying in the Ozark region. 



