Preliminary Sketch of Florida Phosphates, Author’s edition, pp. 18, et seq. Footnote 6: Journal für praktische Chemie, 1st series, Band 38, S. 388. Footnote 7: Annual Report Connecticut Experiment Station, 1890, p. 72. Footnote 8: Annual Report Massachusetts Experiment Station, 1887, p. 233. Footnote 9: Bulletin 21, Rhode Island Experiment Station, 1893. Footnote 10: Chemical Composition of Food-Fishes. Report of U. S. Commissioner of Fish and Fisheries, 1888, pp. 679 et seq. Footnote 11: G. Brown Goode, American Naturalist, Vol. 14, July, 1890. Footnote 12: Comptes rendus, Tome 101, 1885, pp. 65, et seq. Footnote 13: Royal Agricultural Society Journal, Vol. 13, 1852, pp. 349 et seq. Footnote 14: Gîtes Mineraux, par Fuchs et DeLauny, Tome 1, p. 425. Footnote 15: El Salitre de Chile; René F. LeFeuvre y Artūro Dagnino, 1893, p. 12. Footnote 16: Crampton, American Chemical Journal, Vol. II, 1890, p. 227. Footnote 17: Potash, pamphlet of German Kali Works, pp. 3, 4. Footnote 18: Gîtes Mineraux, p. 429. Footnote 19: Bulletin of the Philosophical Society of Washington, Vol. II, p. 142. Footnote 20: Handbook for the Department of Geology of the U. S. National Museum, by Geo. P. Merrill. Footnote 21: Vid. supra, p. 506. Footnote 22: Vid. supra, Plate 120. Footnote 23: Merrill, op. cit. p. 521. Footnote 24: Merrill, op. cit. p. 536. Footnote 25: Merrill, op. cit. p. 545. Footnote 26: Merrill, op. cit. p. 547. Footnote 27: Mineral Physiology and Physiography, p. 251. Footnote 28: Bulletin No. 52, United States Geological Survey, p. 16. Footnote 29: bis (p. 48), Vid. supra, p. 38. Footnote 30: The Formation of Vegetable Mold through the Action of Worms. Footnote 31: Rocks and Soils, pp. 131–2. Footnote 32: Comptes rendus, Tome 110, p. 1370. Footnote 33: Bulletin No. 83, California Experiment Station. Footnote 34: Geological Magazine, Vol. 7, No. 6, pp. 291–92. Footnote 35: Wiley, Agricultural Science, 1893, pp. 106 et seq. Footnote 36: Travaux de la Société des Naturalistes St. Petersburg, Tome 20, 1889. Footnote 37: Rocks and Soils, p. 134. Footnote 38: Beilstein’s Handbuch der Organischen Chemie, Band I, Ss. 891–2. PART SECOND. TAKING SAMPLES OF SOIL FOR ANALYSIS. =54. General Principles.=—It would be unwise to attempt to give any single method of taking soil samples as the only one to be practiced in all circumstances. In the methods which follow it is believed will be found directions for every probable case. The particular method to be followed will in each case have to be determined by circumstances. The sole object in taking a sample of soil should be to have it representative of the type of soils to which it belongs. Every precaution should be observed to have each sample measure up to that standard.