ILLUSTRATIONS. 



NITROGEN BODIES OF MODERN CHEMISTRY. ^^^^' 



Figure 1 ('). Hydrogeu 204 



(-). Oxygeu 204 



(3). Nitrogen . , 204 



(*). Carbou 204 



2. Acetyl 205 



3. Oxygeu 205 



4. Acetate of the oxide of auimonium 205 



5 aud 6. Acetonitryl 205 



7. Nitro-acetonitryl 203 



8. Fulraiuate of mercury 203 



9. Alcohol 203 



10. Nitryl mercury 206 



11 aud 12. Nitro-acel ouitryl 207 



13. Tri-nitro-acetouitryl 207 



14. Detonatiug gas _ 203 



15. Vegetable tibriu 209 



Ifi. Beuzol 213 



CRYSTALLOGRAPHY 233 



Figure 1. Tautozoual faces 238 



2 aud 3. Miller's symbols 240 



4. Miller's symbols 241 



5. Law of zones 242 



6. Spherical projection 243 



7 and 8. Spherical projection 244 



9 aud 10. Spherical projection 245 



11. Spherical projection 243 



12 and 13. Spherical projection 247 



13ff.. Derivation of the system 250 



13&. Derivation of the system 25 1 



14. Monocliuic sj'stem 251 



15. Rhombic system. 251 



IG. Rhombohedral system 251 



17. Tetragonal system 251 



18. Hexagonal system 252 



19. Tesseral system 252 



20. Triclinic system 253 



21. Monocliuic 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 jiolarization 258 



28. Ellipsoid of polarization 253 



29. Ellipsoid of polarization 259 



30. Ellipsoid of polarization 259 



31. Ellipsoid of polarizatiou 260 



