256 SOILS AND FERTILIZERS 



24. Peter : Association of Official Agricultural Chemists, Report 



1895- 



25. Loughridge : American Journal of Science, Vol. VII (1874). 



26. Hilgard : Year-book U. S. Department of Agriculture, 1895. 



27. Houston : Indiana Agricultural Experiment Station, Bulle- 

 tin No. 46. 



28. Mulder: From Mayer: Lehrbueh der Agrikulturchemie, 2. 



29. Journal of the American Chemical Society, Vol. XIX, No. 9. 



30. Year-book U. S. Department Agriculture, 1895. 



31. Loughridge : South Carolina Agricultural Experiment Sta- 

 tion, Second Annual Report. 



32. Association of Official Agricultural Chemists, Report 1893. 



33. Washington Agricultural Experiment Station, Bulletin No. 



13- 



34. Association of Official Agricultural Chemists, Report 1894. 



35. California Agricultural Experiment Station, Report 1890. 



36. Minnesota Agricultural Experiment Station, Bulletin No. 29. 



37. Minnesota Agricultural Experiment Station, Bulletin No. 47. 



38. Lawes and Gilbert : Experiments on Vegetation, Vol. I. 



39. Boussingault : Agronomie, Tome I. 



40. At water : American Chemical Journal, Vol. VI, No. 8 and 

 Vol. VIII, No. 5. 



41. Hellriegel : Welche Stick stoff Quellen stehen der Pflanze zu 

 Gebote? 



42. Minnesota Agricultural Experiment Station, Bulletin No. 34. 



43. Warington : U. S. Department of Agriculture, Office of Ex- 

 periment Stations, Bulletin No. 8. 



44. Hilgard : Association of Official Agricultural Chemists, Re- 

 port 1895. 



45. Marchal : Journal of the Chemical Society (abstract), June, 

 1894. 



46. Kiinnemann: Die Landwirthschaftlichen Versuchs-Stationen, 

 50(1898). 



47. Adametz : Abstract, Biedermann's Centralblatt fur Agrikul- 

 turchemie, 1887. 



48. Atwater : American Chemical Journal, Vol. IX (1887). 



