CONTENTS. 
PLATE 32. 
Fig. 1. Blowpipe, . 
2. Attenuated point ‘af flame caused 
by the DiORIBIPS : 
3. Forceps, 
A, Berzelius blowpipe, 
5. Nicholson areometer, . 
6. Magnetic needle, 
7, ab. Instrument for detecting elec- 
tricity in minerals, 
8. Common goniometer, 
9. Gambay’s do. 
10. Wollaston’s do. 
Forms of Crystallization. 
11, 12. Regular octahedron, 
13. Octahedron abbreviated to a six 
sided plate, 
14. Cube, 
ee Releuen x the eine and Berane: 
dron, 
1G, 17. ‘Ceabie (Cauaean. 
18. Rhombie dodecahedron: 
19: Relation of the Thiombic dinteeee 
hedron and cube, 
20. Pyramidal cube, : 
21,24. Cube with dececahedsal ees 
replacing its edges, . 
Octahedron with odeennedral 
faces, 
22) 
23. Octahedron passing into a ‘dode- 
cahedron, . 
24. See 21, ‘ 
25. Combination of cube faces and 
those of the Si 
cube, : 
26. Tetrahedron, 
27. Octahedron passing into a tetrahe- 
dron, 
28. Cube with its edges replaced by 
three faces, ‘ 
Pentagonal dodecahedron, . 
Trapezohedron, 
Octahedron passing into a trapezo- 
hedron, 
Obtuse square octahedron, ; 
Acute do. do. : : 
Square octahedron with two cor- 
ners truncated, 
Right square prism, . 
Regular eight sided prism, 
Right square prism with its cor- 
ners truncated, 
Square octahedron with traneated 
basal edges, : 
Do. with truncated lateral edges, 
Eight sided pyramid, . : 
Twelve sided prism, . 
Six sided prism with bevelled 
edges, 
Right square prism, with pasal 
edges truncated, . : 
AA. i eeearapie octahedron, 
Ad: We. truncated, 
46. Square octahedron wit bevelled 
lateral edges, 
A7, a. Obtuse rhombic détahedron; 
b. Acute rhombic octahedron, 
c. Rectangular octahedron, 
Rhombic octahedron with two 
corners bevelled, 
29. 
30. 
31. 
32. 
33. 
34. 
35. 
36. 
37. 
38. 
39. 
AO. 
Al. 
42. 
43. 
48. 
PAGE 
XXV 
PAGH 
PLATE 32—(Continued.) 
. 49. Octahedron with the comers of 
the vertical axis replaced by 
four plane faces, A79 
50. Right rhombic prism, 4 480 
51. Do. with obtuse edges truneated, 480 
52. Irregular eight sided prism, 480 
53-55. Combination of prisms belong- 
ing to the trimetric system, 480 
56. Rectangular prism, i 480 
57, 58. Modified octahedrons, . 480 
59, 60. Oblique six sided prism, 481 
61. Octahedron with half the edges 
truncated, A81 
62. Prism with half the basal ‘edges 
truncated, . a 461 
63-65. Oblique rhomboidal prism, 481 
66. Oblique six sided prism, 481 
67. Double six sided pyramid, A481 
68. Pyramidal six sided prism, . A481 
69. Modified rhombic octahedron, A480 
70. Regular six sided prism, . 481 
71. Do. with truncated basal edges,. 481 
72. Do. with truncated corners, A481 
73. Obtuse double six sided pyramid, 481 
74. Sealene octahedron, A81 
75. Rhombohedron, : » aot 
76. Six sided prism with four ‘edges 
bevelled, 48] 
77, 78. Natural — situation a wo 
rhombohedrons, 482 
79. Grouping of erystallizations, A482 
80-87, 90,91. Forms of ground 
jewels, j 486, 512 
88, 89. Crystalline formations, . A482 
90, 91. See 80, &c., A86 
92, 93. Crystalline structure, A482 
PLATE 33. 
Minerals and their Crystalline Forms. 
. 1. Meteoric iron, A487 
2. Iron pyrites, A95 
3, 4. Sulphur, . A85 
5-10. Native bismuth, A488 
6-11. Galena, A493 
7. Weidmannstedtian fisures, 487 
8. Sulphate of lead, 493 
9. Native silver, A87 
10. See 5, A488 
11. See 6, 493 
12. Axborescent native silver, ; 487 
13. Native copper, 488 
14. Native gold, ; A487 
15. Pyrites in calcareous spar, . 495 
16. Filiform native silver, A487 
17. Galena on quartz, 493 
18. Arsenical pyrites, A96 
19. Galena on calcareous spar, 493 
20. Galena in cubes, : A493 
21. Selenid of mercury, 493 
22. Crystallization of iron ee 496 
23. Molybdenite, 4 496 
24. Native copper, . A8R 
25. Native antimony, A89 
26-29. Sulphur, 484 
30. Native silver, A487 
31. Antimony, . 489 
32-36. Gold, calena, &e. 33 487, 493 
37. Sulphuret of copper, . . 495 
38. Antimony, , 489 
