LIST OF ILLUSTRATIONS.
| FIG. | PAGE | |
| 1. | Section of the Eye | [24] |
| 2. | A Camera Obscura | [27] |
| 3. | The Phenakistiscope | [54] |
| 4. | Disc of the Phenakistiscope | [55] |
| 5. | Solar Spectrum | [Frontispiece] |
| 6. | Absorption of Light by Sodium Vapour | [ib.] |
| 7. | Action of a Prism on the Solar Rays | [ib.] |
| 8. | The Recomposition of Light | [86] |
| 9. | Recomposition of Light by means of a Concave Mirror | [87] |
| 10. | Recomposition of Light by means of a number of Mirrors | [88] |
| 11. | Newton’s Disc | [89] |
| 12. | Newton’s Rings | [95] |
| 13. | Reflection from Plane Surfaces | [107] |
| 14. | Refraction | [108] |
| 15. | Experimental Proof of Refraction | [ib.] |
| 16. | The Effects of Plane Mirrors | [109] |
| 17. | Reflection from the Surface of Water | [110] |
| 18. | Concave Mirror | [111] |
| 19. | Conjugate Foci | [113] |
| 20. | Virtual Focus | [114] |
| 21. | Concave Mirror | [ib.] |
| 22. | Magnifying Effect of Concave Mirrors | [115] |
| 23. | The Reversal of real Images | [ib.] |
| 24. | Diminishing Power of Convex Mirrors | [116] |
| 25. | Burning Mirror | [124] |
| 26. | Double Convex Lens | [127] |
| 27. | Forms of Lenses | [128] |
| 28. | Path of a Ray through a Convex Lens | [129] |
| 29. | Path of Divergent Rays through a Convex Lens | [ib.] |
| 30. | Conjugate Foci | [130] |
| 31. | Images formed by Convex Lenses | [131] |
| 32. | Magnifying Property of Convex Lenses | [132] |
| 33. | Diminishing Effect of Concave Lenses | [ib.] |
| 34. | Cannon of the Palais Royal | [134] |
| 35. | Fresnel’s Lighthouse Apparatus | [136] |
| 36. | Lantern of a First-Class Lighthouse | [140] |
| 37. | The Compound Microscope | [143] |
| 38. | The Theory of the Compound Microscope | [144] |
| 39. | Photo-Electric Microscope | [147] |
| 40. | Solar Microscope | [148] |
| 41. | The Galilean Telescope | [155] |
| 42. | The Astronomical Telescope | [156] |
| 43. | Section of an Astronomical Telescope | [157] |
| 44. | Section of the Gregorian Telescope | [160] |
| 45. | Gregorian Telescope | [161] |
| 46. | Section of a Newtonian Telescope | [162] |
| 47. | Herschellian Telescope | [164] |
| 48. | Foucault’s Large Telescope | [169] |
| 49. | Foucault’s Small Telescope | [171] |
| 50. | Section of the Magic Lantern | [179] |
| 51. | Magic Lantern | [182] |
| 52. | The Phantasmagoria | [184] |
| 53. | The Phantascope | [185] |
| 54. | Phantasmagoria (Robertson) | [194] |
| 55. | Wizard Dance | [198] |
| 56. | Nostradamus and Marie de Médicis | [201] |
| 57. | The Arrangement of the Reversing Prism | [203] |
| 58. | The Goat Trick | [205] |
| 59. | How to see through a Brick | [207] |
| 60. | The Polemoscope | [210] |
| 61. | Protection against ill-natured People | [213] |
| 62. | [218] | |
| 63. | Anamorphosis | [220] |
| 64. | Effect of Cut Paper-work | [225] |
| 65. | Seditious Toys | [229] |
| 66. | Diorama | [234] |
| 67. | [237] | |
| 68. | Stereoscope | [238] |
| 69. | The Principle of the Refracting Stereoscope | [239] |
| 70. | The Camera Obscura | [243] |
| 71. | Section of Camera Lucida | [247] |
| 72. | The Spectre—an Optical Illusion | [269] |
| 73. | How to produce Spectres | [271] |
THE WONDERS OF OPTICS.
PART I.
THE PHENOMENA OF VISION.