SOILS FERTILIZERS. 619 



Eckman, W. S. Lyman. F. C. Seluoc^dei-, T. I>. Kiro. aiul H. ('. Smith: liiowiis- 

 ville area. Texas, by A. W. MauKiim ami O. Lee. Jr.; Cooper area, Texas, by 

 T. L). Kice and II. C. Smith; (,'oiivvay County, Ark., by J. L. Burgess and (". W . 

 Ely; Giles County, Tenn., by O. L. Ayrs and M. W. Gray; Marion County. Ind.. 

 by W. J. Geib and F. C. Schroeder; North Platte area, Nebr., by E. L. AVorlhen 

 and O. L. Eckman: Morton area. X. Dak., by T. D. Rice, R. Babcock, and J. T. 

 Weaver; McKenzie area. N. Dak., by A. E. Kocher and R. P. Stevens; Belle- 

 fourclie area. S. Dak., and Minidoka area, Idaho, by A. T. Strahorn and C. W. 

 Mann; Colusa area, Cal.. by M. H. Lapham, A. T. Sweet. A. T. Strahorn, and 

 L. C. Holmes; Redding area. Cal., by :M. H. Lapham and L. C. Holmes; Butte 

 Valley. Siskiyou County. Cal., by W. W. Mackie; and Bellingliam area. AVash.. 

 by A. W. Mangum and L. A. Hurst. 



During the calendar year 1007, 19,471 square miles, or 12,461.440 acres, were 

 surveyed and mapped on a scale of 1 in. to the mile, making the total area sur- 

 veyed and mapped up to the end of that year 149,801 square miles, or 9r),S7l2,(i4(» 

 acres. The average cost of the field work in 1907 was .$.'^.29 iier square mile. 



A development of the soil survey work during the year was the undertaking 

 of surveys in connection with the federal reclamation jirojects, including the 

 .Minidoka i)roject in southern Idaho and the Bellefourche jtroject in western 

 South Dakota. 



General classification of Florida soils Ula. (Jiiart. Bill. Aijr. Dc/iL. I'J 

 {1909), .Vo. .]. pp. 25-36). — Descriptions are given of the principal types of Flor- 

 ida soils, K'lassified as first, second, and third rate pine lands, high hammock 

 and low hammock lands, and swamp lands. 



Soils, R. I>. Watt iTraii.-irdal D'pt. Ayr. Ann. Rpt. 190S. pp. 239-.i6.'j). — 

 Analyses of a number of samjiles of soils from different parts of the Transva.-il 

 are reported, the results in general confirming the conclusions from previous 

 investigations that the soils of the Transvaal are as a rule poor in phosjthoric 

 acid, lime, and nitrogenous organic matter, but moderately rich in potash. 



Nitrification in Transvaal soils, R. I). W.vtt {Transvaal Dcpt. Agr. Ann. 

 Rpt. 1908, pp. 27Jf-277). — Studies of the rate of nitrification in culture solutions 

 inoculated with Transvaal soils are reported, indicating that during the sum- 

 mer, with a fair amount of moisture in the soil and a higher day and night 

 temperature than in England, nitrification is more rapid in the Transvaal soils 

 than in those of England. As a rule the .solutions nitrified most rajtidly when 

 inoculated with soils rich in both organic matter and carbonate of lime, but 

 even in jtoor sandy soils containing very little organic matter and only a trace 

 of lime nitrification was more rapid than in good English soil. 



Nitrifying bacteria in North Carolina soils, K. F. Ki;i-lerm.\x and T. R. 

 Robinson {Hcicnce, u. ser., SO (1909), No. 769, pp. .'//./, '//'/). — Referring to in- 

 vestigaticms by Stevens and Withers on nonnitrifying soils in North Carolina 

 (E. S. R., 21, p. 22), the authors report studies of a large number of North 

 Carolina soils which substantiate the conclusion *' that nitrification is at a rather 

 low ebb in North Carolina soils, yet nitrifying bacteria ar(j .generally present, 

 and if supi)lied with suitable food would undoubtedly soon nmltipl.x suffi- 

 ciently to cause a normal rate of nitrification." 



Studies in soil bacteriology, II. Ammonification in soils and in solutions, 

 F. L. Stkvens, W. a. WrniEKS, et al. {(Jrnthl. liakt. \('tc.], 2. AM., 23 {1909), 

 No. 21-25, pp. 776-785). — The studies reported in this article were made by 

 bacteriological methods similar to those ust'd in investigations on nitrification 

 previmisly noted (I']. S. R., 21, i). US). 



The general i)urpose of the investigiitions was to ascertain whetlK'r reliable 

 conclusions regarding the ammonifying power of a soil can be had by a study 

 of its effect when inoculated into solutions. The general conclusion is tliai 



