1»16] SOILS — FEETILIZEBS. 117 



but attention is called to the fact " that the averages for the period 1886-1895 

 are almost invariably higher than those of any previous or succeeding period, 

 and considerably above those of the average to date, while those for the period 

 190&-1915 are lower than any of the preceding ones." 



SOILS— FERTILIZEKS. 



Soil survey of the Merced area, California, E. B. Watson et ax. (U. S. Dept. 

 Agr., Advance Sheets Field Operations Bur. Soils, 1914, PP- 70, pis. 4, fig. 1, 

 map 1). — This survey, made in cooperation with the California Experiment Sta- 

 tion and issued April 20, 1916, deals with the soils of an area of 614,400 acres, 

 including nearly all of Merced County, California, and located nearly midway 

 between the northern and southern ends of the San Joaquin Valley. The 

 topography ranges from that of the foothills proper to flat. " The soils of the 

 area fall naturally into four groups, (1) residual soils, (2) soils derived from 

 old valley-filling material, (3) soils derived from i-ecent alluvium and later 

 valley-filling material, and (4) miscellaneous material." Forty-five soil types of 

 14 series are mapped of which the Madera series and the Fresno series are the 

 most extensive. 



Soil survey of "Warren County, Indiana, E. J. Gkimes and E. H. Stevens 

 ( U. 8. Dept. Agr., Advance Sheets Field Operations Btir. Soils, 1914, PP- 39, fig. 1, 

 map 1). — This surveJ^ made in cooperation with the Indiana Department of 

 Geology and issued April 12, 1916, deals with the soils of an area of 235,520 

 acres in western Indiana, the topography of wliich varies from level to un- 

 dulating and broken, and in which " all the formerly water-logged areas of the 

 prairie have been reclaimed by artificial drainage. . . . 



•' The soils of Warren County are derived largely from the unconsolidated 

 deposits of the early Wisconsin glaciation." Including meadow, muck, gravel 

 pits, and steep broken land, 15 soil types of 7 series are mapped, of which the 

 Carrington and Miami silt loams and the Clyde silty clay loam cover, respec- 

 tively, 37.4, 29.7, and 18.S per cent of the area. 



Soil survey of Muscatine County, Iowa, H. W. Ha\«kek and H. W. Johnson 

 (17. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1914, PP- 64, fig- 1, 

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

 and issued April 10, 1916, deals with the soils of an area of 276,480 acres in 

 southea.stern Iowa which lies in the glacial and loessial and river flood plain 

 soil provinces. The topography is mainly level to gently rolling, with some 

 hills and ridges. 



The soils of the county are of glacial origin. Including marsh, muck, meadow, 

 and river wash, 28 soil types of 9 series are mapped, of which the Muscatine, 

 Memphis, and Buckner silt loams cover, respectively, 37.2, 19.7, and 7.5 per cent 

 of the area. 



Soil survey of Seward County, Nebraska, A, H. Meter, E. H. Smies, L. T. 

 Skinner, aud W. A. Rockie ( V. S. Dept. Agr., Advance Sheets Field Operations 

 Bur. Soils, 1914, PP- 40, fig- 1, map 1). — This survey, made in cooperation with 

 the Nebraska Soil Survey and issued April 25, 1916, deals with the soils of an 

 area of 367,360 acres in southeastern Nebraska, the topography of which varies 

 from flat to hilly and deeply dissected. " The streams are few, and there are 

 sections in the county which are not tapped by any drainage way. Drainage is 

 quite well developed, except on the broad divides in the western part of the 

 county." 



The soils are classified as upland, terrace, and first bottom soils. Eleven 

 soil types of 7 series are mapped of which the Grundy silt loam covers 61.5 and 

 the Wabash silt loam 12.3 per cent of the area. 



