1916] SOILS FERTILIZERS. 811 



is acid-soluble, but only a small part of the titanium. The silica is very uni- 

 formly distributed but, in contrast to the alumina, is in each area slightly 

 higher in the first than in the second foot. Sulphur and baryta show no de- 

 pendence upon either depth or aridity. About half of the former is acid-solu- 

 ble, but none of the latter. To litmus the samples are all neutral or very 

 slightly alkaline. The acid-insoluble matter shows no definite relation to the 

 aridity and, except that it is higher in the first than in the second foot, none to 

 the depth. The proportion of acid-insoluble material in the nonvolatile, car- 

 bonate-free portion of the soil is highest in the surface foot and similar in the 

 lower levels, as though leaching had affected the silicates of only the first foot. 



" In mechanical compositions these loess soils show the same characteristics as 

 the Russian chernozem. Also, in the chemical composition of the inorganic por- 

 tion, both the total and the acid-soluble, in so far as the available data permit 

 of comparisons, there is a very marked similarity. 



"A comparison with the average composition of arid and humid soils shows 

 that, except in the proportions of manganese, the first foot samples of the loess 

 soils from the most humid areas studied resemble the arid soils as much as do 

 those from the distinctly semiarid western areas. In the case of this one con- 

 stituent the soils from the eastern areas resemble those from the humid regions 

 reported by Hilgard. In carbonate content the subsoils from the western and 

 intermediate areas resemble arid subsoils and those from the eastern areas the 

 humid soils." 



A list of 15 references to literature bearing on the subject is appended. 



Soil survey of Laurens County, Georgia, A. T. Sweet, G. B. Jones, E. T. 

 Maxon, T. M. Mokrison, and E. C. Hall ( U. S. Dept. Agr., Advance Sheets Field 

 Operations Bur. Soils, 1915, pp. 41, fiff- 1, t^^cbp 1). — This survey, made in coopera- 

 tion with the Georgia State College of Agriculture and issued September 12, 

 1916, deals with the soils of an area of 509,440 acres in the higher Coastal 

 Plain in central Georgia. 



" The topography ranges from undulating or rolling, or even broken in places 

 in the northern part of the county and near the large streams, to almost flat in 

 sections of the soutliern part. . . . The soils of the county are derived from 

 the unconsolidated sediments of the Coastal Plain. They are prevailingly 

 sandy in the surface portion and have sandy clay subsoils." Including swamp, 

 17 soil types of 13 series are mapped, of which the Norfolk sandy loam and the 

 Grady sandy loam cover 33.4 and 11.1 per cent of the area, respectively. 



Analyses of soil types of Troup County, W. A. Worsham, Jr., L. M. Carter, 

 D. D. Long, and M. W. Lowry {Biil. Ga. State Col. Agr., No. 92 {1915), pp. 28, 

 figs. 2). — This bulletin reports general soil survey data for the county and gives 

 the results of chemical analyses of samples of all the types mapped, together 

 with suggestions for utilizing the potential fertility of the soils. 



Soil survey of Dekalb County, Missouri, H. H. Krusekopf, R. C. Doneghue, 

 and M. M. McCool (f7. S. Dept. Agr., Advance Sheets Field Operations Bur. 

 Soils, 1914, pp. 25, fig. 1, map 1). — This survey, made in cooperation with the 

 Missouri Experiment Station and issued September 9, 1916, deals with the soils 

 of an area of 266,880 acres in the gently rolling prairie region of northwestern 

 Missouri, the topography of which varies from level to rolling. Regional drain- 

 age is well developed. The soils of the county are of glacial, loessial, and 

 alluvial origin. Seven soil types of 5 series are mapped, of which the Shelby 

 loam and the Grundy silt loam cover 54.4 and 24.9 per cent of the area, respec- 

 tively. 



Soil survey of Wayne County, North. Carolina, B. B. Derrick, S. O. Per- 

 kins, and F. N. McDowell (U. S. Dept. Agr., Advance Sheets Field Operations 

 Bur. Soils, 1915, pp. 51, fig. 1, map 1). — This survey, made in cooperation wltb 



