SOILS AND FERTILIZERS 13 



NITROGEN-FIXING BACTERIA. 



Inoculation of soil with nitrogen-fixing bacteria. 1905. 10 pages. Paper, 



5c. A 19.3 : 72 4 



Tests of commercial cultures of nitrogen-fixing bacteria. 1906. 1 page. 



Paper, 5c. A 1.4 : 16 



OATS. See, in this list, heading Fertilizers. 



ONTARIO COUNTY, N. Y., Soil survey. 55 pages, 1 illus. map. [From Field 

 Operations, 1910.] Paper, 15c. A26.5 a :On8 



ORANGE. See, in this list, heading Fertilizers. 



ORGANIC CONSTITUENTS. 



Certain organic constituents of soils in relation to soil fertility. 1907. 52 



pages, illus. Paper, lOc. A 26.3: 47 



Chemical nature of soil organic matter. 1910. 48 pages, illus. Paper, lOc. 



A 26.3 : 74 



Isolation of harmful organic substances from soils. 1909. 53 pages, illus. 

 Paper, 15c. A 26.3 : 53 



Organic compounds and fertilizer action. 1911. 31 pages, illus. Paper, 5c. 



A 26.3 : 77 

 Organic constituents of soils. 1913. 18 pages. Paper, 5c. A 26.4 : 74 



Some effects of harmful organic soil constituent. 1910. 98 pages, illus. 

 Paper, 20c. A 26.3 : 70 



Some organic soil constituents. 1913. 41 pages, illus. Paper, lOc. 



A 26.3: 88 

 See, also, in this list, heading Creatinine Dihydroxystearic acid. 



OTOE COUNTY, NEBR., Soil survey. 31 pages, 1 illus. map. [From Field 

 Operations, 1912.] Paper, 15c. A 26.5 a : Ot 6 



OXIDATION. 



Role of oxidation in soil fertility. 1909. 52 pages. Paper, lOc. A 26.3 : 56 

 Studies in soil oxidation, 1910. 57 pages. Paper, lOc. A 26.3 : 73 



PAYNE PRAIRIE. Soil survey of Payne Prairie, Gainesville area, Fla. 1912. 

 5 pages, illus. Paper, 5c. A 26.4 : 72 



PENDER CO., N. C. 



Preliminary report of soils. 1910. 16 pages. Paper, 5c. A 26.4 : 20 



Soil survey. 45 pages, 1 illus. map. [From Field Operations, 1912.] 

 Paper, 15c. A26.5 a :P373 



PENNSYLVANIA. 



Agriculture in coal regions of southwestern Pennsylvania. Pages 321 to 

 332. [From Yearbook, 1909.] Paper, 5c. A1.10 a :516 



Recomioissance soil survey of northeastern Pennsylvania. 63 pages, 1 illus. 

 map. [From Field Operations, 1911.] Paper, 15c. A 26.5 a : P 3S4 4 



PERQUIMANS AND PASQUOTANK COUNTIES, N. C., Soil survey. 22 pages, 

 1 illus. map. [From Field Operations-, 1905.] Paper, 15c. 



A 26.5 a : P 425 



PHOSPHATES. 



Absorption of phosphates and potassium by soils. 1910. 39 pages, illus. 



Paper, lOc. A 26.3: 32 



Mineral phosphates as fertilizers. (In Agriculture Yearbook, 1S94, pages 



177 to 192, Illus.) Cloth, 50c. A 1.10: 894 



Report on natural phosphates of Tennessee, Kentucky, and -Arkansas. 



1912. 36 pages, illus. map. Paper, lOc. A 26.3 : 81 



Report on phosphate fields of South Carolina. 1913. 12 pages, illus. 



Paper, 5c. A 1.3 : 18 



Review of phosphate fields of Florida. 1911. 23 pages. Paper, 5c. 



A 26.3 : 76 



NOTE. In ordering publications from this List use the words of the title as far as the 

 first period, and all the composite number which follows the price. 



