LIST OF ILLUSTRATIONS 



Figure i. Apparatus for crushing mineral fertilizers 12 



2. Plate grinder for minerals 13 



" 3. Shaking apparatus for superphosphates 92 



" 4. Shaking machine for ammonium magnesium phosphate 96 



" 5. Rossler ignition furnace 97 



Plate, figure 6. Huston's agitating machine opposite 1 16 



Figure 7. Huston's mechanical stirrer 118 



" 8. Jones' reduction tube 171 



" 9. Reductor and filter attachment 175 



10. Permanganate burette i?5 



" ii. Wagner's digestion apparatus for slags 202 



" 12. Lasne's apparatus 268 



Plate, figure 13. Wild duck's and eggs on Layson Island opposite 291 



Figure 14. Mercury pump and azotometer 3 2 ^ 



" 15. Moist combustion apparatus of the Halle agricultural laboratory.... 359 



" 1 6. Distillation apparatus of the Halle agricultural laboratory 361 



Plate, figure 1 7. Hood opposite 367 



Plate, figure 18. Distilling apparatus opposite 367 



Figure 19. Trap of distilling apparatus 369 



" 20. Schloesing's apparatus for nitric acid 393 



" 21. Schloesing-Wagner apparatus 398 



22. Warington's apparatus for nitric acid 399 



23. Schulze-Tiemann's nitric acid apparatus 404 



24. Spiegel's apparatus for nitric acid 408 



" 25. DeKonnick's apparatus 409 



" 26. End of delivery tube 410 



27. Schmidt's apparatus 413 



" 28. Lunge's nitrometer 415 



" 29. Lunge's improved apparatus 417 



30. Lunge's analytic apparatus 420 



31. Gantter's nitrogen apparatus 422 



" 32. Halle nitric acid apparatus 436 



33. Stoklasa's nitiic acid apparatus 439 



" 34. Apparatus of Monnier and Auriol 441 



35. McGowan's apparatus for the iodometric estimation of nitric acid 451 



36. Apparatus of Gooch and Gruener 454 



37. Apparatus of Chabrier 475 



" 38. Schaeffer's nitrous acid method 478 



39. Water distilling apparatus, Bureau of Chemistry 482 



Plate, figure 40. Scene showing mining operation opposite 490 



Plate, figure 41. Drilling in potash mine preparatory to blasting opposite 490 



Plate, figure 42. Scene during lunch hour in a potash mine opposite 490 



Figure 43. Geological relations of the potash deposits near Stassfurt 507 



44. Diagram showing law of crystallization of potash salts 511 



45. Graphic representation of theory of crystallization 513 



46. Graphic representation of the deposition of different salts 514 



" 47. Apparatus for making pure chlorplatinic acid 576 



