_Estimation of Potash as Perchlorate_, pp. 289-301.—General principles; Caspari’s method of preparing perchloric acid; Kreider’s method; Keeping properties of perchloric acid; The analytical process for determining potassium as perchlorate; Removal of sulfuric acid; Applicability of the process; Accuracy of the process; Authorities cited in Part Third. PART FOURTH. _Miscellaneous Fertilizers_, pp. 302-324.—Classification; Forms of lime; Application of lime; Action of lime; Analysis of lime; Gypsum, or land plaster; Analysis of gypsum; Common salt; Green vitriol; Stall manures; Hen manure; Guanos and cave deposits; Official French method for phosphoric acid in guanos; Leather waste; Wood ashes; Analysis of wood ashes; Method of analysis used in this laboratory; Official method for estimating alkalies in wood ashes; Statement of results; Authorities cited in Part Fourth; Index. ILLUSTRATIONS TO VOLUME SECOND. Page. Figure 1. Apparatus for crushing mineral fertilizers 5 “ 2. Plate grinder for minerals 6 “ 3. Shaking apparatus for superphosphates 60 “ 4. Shaking machine for ammonium magnesium phosphate 64 “ 5. Rössler ignition furnace 65 “ 6. Wagner’s digestion apparatus for slags 79 “ 7. Jones’ reduction tube 115 “ 8. Huston’s digesting apparatus 142 “ 9. Huston’s mechanical stirrer 145 “ 10. Mercury pump and azotometer 174 “ 11. Moist combustion apparatus of the Halle agricultural laboratory 201 “ 12. Distillation apparatus of Halle agricultural laboratory 203 “ 13. Distilling apparatus 208 “ 14. Schlöesing-Wagner apparatus 229 “ 15. Halle nitric acid apparatus 234 “ 16. Gantter’s nitrogen apparatus 237 “ 17. Geological relations of the potash deposits near Stassfurt 258 VOLUME SECOND. EXAMINATION OF FERTILIZING MATERIALS, FERTILIZERS, AND MANURES. PART FIRST. PRELIMINARY TREATMENT AND PHOSPHATES.