APPENDIX 11 345 



Soil Physics. 

 Warington. Physical Properties of Soils, Oxford, igoo. 

 King. Physics of Agriculture, Madison, Wis., 1901. 

 Hellriegel. B. z. d. nat. Grundlagen des Ackerbaues, 



Braunschweig, 1883. 

 MOSIER and GUSTAPSON. Soil Physics, Philadelphia, 1917. 

 Lawes and Gilbert. Rot hams ted Memoirs, Vol. III., No. 



11 ; Vol. V., No. 5. 

 Briggs. U.S. Bureau of Soils, Bull. 45, 1907. 

 Keen. "Soil and Water Content," / Agric. Sci , 1920, 10, 44. 

 Livingstone and Hawkins. Water Relation between Plant and 



Soil, 191 5. 



The Soil Solution. 



Whitney and Cameron. Chemistry of the Soil as related to 

 Crop Production, U.S. Bureau of Soils, Bull. 22, 1903. 



Cameron. The Soil Solution, Easton. 



Hall, Brenchley, and Underwood. Phil. Trans., B. 191 3, 

 204, 179. 



Bouyoncos. Michigan Tech. Bull., 24, 31, 36, 37, 42 (1915-18). 



Hall and Miller. "Retention of Bases by the Soil," Proc. 

 Roy. Soc, B. 1905, 77, 1. 



Soil Organisms. 

 Wollny. Zersetzung der Organischen Stoffc, Heidelberg, 1897. 

 Omeliansky. Compt. Rend., 121 (1895), 653 ; 125 (1897), 970. 

 Winogradsky. Compt. Rend., 121 (1895), 742. 

 Lafar. Technische Mycologie, 2nd ed., Fischer, Jena, 1904. 

 Hutchinson and Clayton./. Agric. Sci., 1919, 9, 143. 



Fixation of Nitrogen. 

 Lawes and Gilbert. Phil. Trans., II., 431, 1861 ; B. I., 1889. 

 Lawes and Gilbert./. R. Ag. Soc, E., 3rd s., II., 657, 1891. 

 Hellriegel and Wilfarth. D. Land. Vers. Stat., 460, 18S7. 

 Nobbe and Hiltner. D. Land. Vers. Stat., 1899. 

 Winogradsky. Compt. Rend., 118 (1894). 

 Maze. Ann. dc I'lnsl. Pasteur, n (1897). 

 Jacobitz. Cent, fur Bakt., II., 1901, 7, 783. 

 Beijerinck. Cent, fur Bakt., II., 1902, 9, 3. 



Nitrification. 



Schloesing and Muntz. Compt. Rend., 80 (1877), 1250. 

 Warington. / C. S., 1878, 1879, 18S4, 1891. 



