3 o4 APPENDIX II 



37. Winogradsky. — Compt. Rend., 113 (1893), 116. 



38. Deh£rain. — Ann. Agron., 19, 409. 



39. King. — Wisconsin Ag. Exp. Station Annual Reports, 17 



(1900), 18 (1901). 



40. Boullanger and Massol. — Ann. Pasteur, 1903, 17, 492. 



Denitrification. 



41. Gayon and Dupetit. — Compt. Rend., 95 (1882), 644. 



42. Wagner. — D. Landw. Presse, 1895, 123. 



43. Warington.— J. R. Ag. Soc, E., 3rd s., 8. 



44. Stoklasa. — Cent.f. Bakt, 7 (1901), 260. 



Mycorhiza. 



45. STAHL.—Ja/ir&.f. wiss. Botanik., 34. 



Absorption of Salts by Soil. 



46. Way.—/. R. Ag. Soc, E., 1st s., 11, 323 ; 13, 123. 



47. Voelcker.— /. R. Ag. Soc, E., 1st s., 21 (i860), 93; 25 



(1864), 333. 



48. Voelcker.—/. R. Ag. Soc, E., 2nd s., 10 (1874), 132. 



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



2nd s., XVII. (1881), 241 ; XVIII. (1882), 1. 



50. Hall and Gimingham, Trans. Chem. Soc, 91 (1907), 677. 



Alkali Soils. 



51. Hilgard.— U.S. Dep. of Agric. Year-Book, 1895, 103. 



52. Hilgard.— Univ. of California Ag. Exp. Sta. Bull. 128 (1900). 



53. Willcocks. — Egyptian Irrigation, 2nd ed. 



Soil Surveys, etc. 



54. Schimper, A. F. Vt.—Pflanzen Geographie, Jena, 1898. 



55. U.S. Dep. of Agric, Div. of Soils, "Field Operations," 1901. 



56. Whitney.— "Tobacco Soils," U.S. Dep. of Agric. Bull. 11, 



1898. 



57. Veitch.—" Maryland Soils," Maryland Ag. Exp. Sta. Bull 



70, 1901. 

 See also Nos. 3 and 4, 



