1916] SOILS FERTILIZERS. 421 



has been reported to have an average fall of 1,031 tons per square mile per 

 annum. 



The connection between sunlight, pure air, and health is discussed, atten- 

 tion being called especially to the screening effect of dust-polluted air. 

 Experiments made at Manchester are cited to show that " on a sunny day 

 no less than 12 per cent of the sunlight is cut off in the last 100 ft. of the 

 atmosphere." 



International catalogue of scientific literature. F — Meteorology {Inter nat. 

 Cat. Sci. Lit., 13 (1916), pp. y///+jfS7).— " The literature indexed is mainly 

 that of 1913, but includes those portions of the literature of 1901-1912 in 

 regard to which the index slips were received by the Central Bureau too 

 late for inclusion in the previous volumes." The sections on the relation 

 of climate to agriculture, forestry, and geogi'aphy and geology, and on 

 phenology contain some 73 references having more or less direct bearing upon 

 agricultural production. 



SOILS— FERTILIZERS. 



The soil and its cultivation, P. Diffloth (Le Sol et les Labonrs. Paris: 

 J. B. Bailliere and Sous, 1916, 4- ed., rev. and enl., pp. 512, figs. 20//). — This 

 is the fourth revised and enlarged edition of this book (E. S. R., 18, p. 316). 

 It is divided into four main parts, as follows : Agrolog5% soil cultivation, soil 

 improvement, and reclamation of waste soils. 



Soil survey of Clay County, Georgia, W. G. Smith and N. M. Kirk (U. S. 

 Dept. Agr., Advance Sheets Field Operations Bur. Soils, 19Vf, pp- 46, fig. 1, 

 map 1). — This survey, made in cooperation with the Georgia State College of 

 Agriculture and issued May 31, 1916, deals with the soils of an area of 133,760 

 acres lying within the Coastal Plain province in southwestern Georgia. The 

 topography is generally level or gently rolling with deep, narrow valleys along 

 the streams. " The drainage system is quite complete, reaching into every part 

 of the county, although the streams are still actively cutting." 



" The soils of the county are comprised broadly in two divisions or soil 

 provinces, (1) the Coastal Plain .soils, or soils of the uplands, and (2) the 

 alluvial soils, consisting of (a) the stream terrace soils and (b) stream bottom 

 soils. The Coastal Plain division includes unconsolidated old sedimentary 

 materials — beds of gravel, sand, clay, and sandy clay — and still older (under- 

 lying) beds of consolidated material, chiefly limestone." 



Including meadow and rough gullied land, 26 soil types of 13 series are 

 mapped, of which the Norfolk fine sand is the most extensive, covering 21.4 

 per cent of the area. "There are no soils of sufficient extent or agricultural 

 value to dominate the agriculture of the region." 



Soil survey of Turner County, Georgia, E. C. Hx\ll and D. D. Long {U. S. 

 Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1915, pp. 28, fig. 1, 

 map 1). — This survey, made in cooperation with the Georgia State College of 

 Agriculture and issued June 3, 1916, deals with the soils of a well-drained area 

 of 177,920 acres in south-central Georgia, the topography of which ranges 

 from undulating to rolling. The soils of the county belong in the Coastal 

 Plain and river flood plains soil provinces and are of sedimentary and alluvial 

 origin. Including swamp, 12 soil types of 7 series are mapped, of which the 

 Tifton, Norfolk, and Plummer sandy loams occupy 31.3, 30.4, and 17.6 per 

 cent of the area, respectively. 



Winnebago County soils, C. G. Hopkins, J. G. Mosiek, E. Van Alstine, and 

 F. W. Gareett (Illinois Sta. Soil Rpt. 12 (1916), pp. 76, pis. 2, figs. 7).— This 

 is the twelfth of the Illinois county soil reports. 



