ILLUSTRATIONS. 



Page. 

 NITROGEN BODIES OF MODERN CHEMISTRY. 



Figure 1 (^). Hydrogeu -204 



(-). Oxygen 204 



(■*). Nitrogen . 2U4 



(*). Carboa 204 



2. Acetyl 205 



3. Oxygen 205 



4. Acetate of the oxide of auunoniuui 205 



5 and 6. Acetonitryl 205 



7. Nitro-acetouitryl 203 



8. Fulminate of mercury 201! 



9. Alcohol 20!) 



10. Nitryl mercury 20G 



11 and 12. Nitro-acel onitryl 207 



13. Tri-nitro-acetonitryl 207 



14. Detonating gas 208 



15. Vegetable librin 209 



16. Benzol .' 2i:j 



CRYSTALLOGRAPHY 238 



Figure 1. Tautozoual faces 238 



2 and 3. Miller's symbols 240 



4. Miller's symbols 241 



5. Law of zones 242 



6. Spherical projection 243 



7 and 8. Sx)herical projection 244 



9 and 10. Sjiherical projection 245 



11. Spherical projection 24G 



12 and 13. Spherical projection 247 



13a. Derivation of the system 250 



13&. Derivation of the system 251 



14. Monoclinic system 251 



15. Rhombic system 251 



1(). Rhombohedral system 251 



17. Tetragonal system 251 



18. Hexagonal system 252 



19. Tesseral system .■ 252 



20. Triclinic system 253 



21. Monoclinic system 253 



22. Orthorhombic system 253 



23. Rhombohedral system 254 



24. Tetragonal system 254 



25. Hexagonal system 255 



26. Tesseral system 256 



27. Ellipsoid of polarization 258 



28. Ellipsoid of polarization 258 



29. Ellipsoid of polarization 259 



30. Ellipsoid of i^olarization 259 



31. Ellipsoid of polarization 260 



