APPENDIX 11 303 



Soil Physics. 



15. WARINGTON. — Physical Properties of Soils, Oxford, 1900. 



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



17. Hilgard. — U.S. Dep. of Agric, Weather Bureau, Bull. 3, 



1892. 



18. Whitney. — U.S. Dep. of Agric, Weather Bureau, Bull. 4, 



1892. 



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



Braunschweig, 1883. 



20. Lawes and Gilbert. — Rothamsted Memoirs, Vol. III., No. 



II j Vol. V., No. 5. 



21. BRIGGS. — U.S. Dep. of Agric. Year-Book, 1900, 397. 

 See also Hilgard, No. 7 ; Wollny, No. 20. 



Soil Organisms. 



22. Wollny. — Zersetzung der Organise/ten Stoffe, Heidelberg, 



1897. 



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



97o. 



24. WiNOGRADSKY.— Compt Rend., 121 (1895), 742. 



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



Fixation of Nitrogen. 



26. Lawes and Gilbert.—/^//. Trans., II., 431, 1861 ; B. I., 



1889. 



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



1891. 



28. Hellriegel and Wilfarth. — D. Land. Vers. Stat., 460, 



1887. 



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



30. Winogradsky. — Co?npt. Rend., 118 (1894). 



31. Maz£. — Ann. de VInst. Pasteur, 11 (1897). 



32. jACOBlTZ.~Cent.fi/rBakt., II., 1901, 7, 783. 



33. Beijerinck. — Cent, fur Bakt. y II., 1902, 9, 3. 



Nitrification. 



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



35. Warington.— /. C. S., 1878, 1879, l88 4> 1891. 



36. Lawes, Gilbert, and Warington.—/. R. Ag. Soc, E. t , 



2nd s., 19 (1883). 



