Note 111 — PART FIRST. PRELIMINARY TREATMENT AND PHOSPHATES. (continued 3)

Proceedings of the Association of Official Agricultural Chemists, Atlanta, 1884, p. 19. Report of Indiana State Board of Agriculture, 1882, p. 230, and Proceedings of the Association of Official Agricultural Chemists, Atlanta, 1884, p. 30. Huston and Jones. (These gentlemen are now investigating all materials used as sources of phosphoric acid in fertilizers; their results here quoted are from unpublished work, and include but a small part of the work so far done.) American Chemical Journal, March, 1884, p. 1. Proceedings of the Association of Official Agricultural Chemists, Atlanta, 1884, p. 23. Ibid, p. 28. Ibid, p. 38. Ibid, p. 45. U. S. Department of Agriculture, Chemical Division, Bulletin No. 7, p. 18. Ibid, Bulletin No. 28, p. 171. Ibid, Bulletin No. 31, p. 100. Ibid, Bulletin No. 31, p. 99.