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1. Preliminary remarks; 2. On the situation, structure, and furniture of an observatory; 3. Rotative dome; 4. Refracting telescopes with celestial eye-pieces; 5. Diagonal eye-pieces; 6. Celestial eye-pieces with variable powers; 7. Erect eye-pieces; 8. A popular explanation of the achromatism of the refracting telescope; 9. Stands for achromatic telescopes; 10. Equatorial or parallatic stands; 11. The construction and use of the dynameter; 12. The Dorpat refracting telescope; 13. On reflecting telescopes; 14. Stands for reflecting telescopes; 15. The Herschelian forty feet reflector; 16. Herschelian telescope as constructed by Ramage; 17. On the space-penetrating powers of telescopes; 18. An historical account of the different methods of measuring small celestial arcs; 19. Spider’s-line micrometer; 20. Other methods of determining the value of a screw; 21. Micrometrical scale with a constant magnifying power; 22. On the different methods of illuminating the lines in the eye-piece of a telescope; 23. A new polymetric reticle; 24. Reticulated diaphragms; 25. Circular and annular micrometers; 26. La Caille’s method; 27. Smeaton’s method; 28. Dollond’s object-glass micrometer; 29. Experimental determination of the focal length and errors of a divided object-lens; 30. Dollond’s improved object-glass micrometer; 31. Dioptric micrometers; 32. Dioptric micrometer by T. Jones; 33. The divided eye-lens micrometer; 34. Ramsden’s catoptric micrometer; 35. Dr Maskylene’s prismatic micrometer; 36. The cuneiform micrometer; 37. Rochon’s crystal micrometer; 38. Methods of determining the constant angle of a doubly refracting prism of rock crystal; 39. The ocular crystal micrometer; 40. The spherical crystal micrometer; 41. Brewster’s micrometrical telescope; 42. The lamp-micrometer; 43. Binocular spider’s-line and glass-disc micrometers; 44. On the use of position micrometers; 45. Comparison of several micrometers; 46. On clamps and tangent screws; 47. On the vernier; 48. On the reading microscope; 49. On the plumb-line; 50. On the spirit-level; 51. On artificial horizons; 52. On Flamsteed’s and La Caile’s methods of observing; 53. On the transit clock; 54. The transit instrument; 55. A portable transit-instrument; 56. Directions for the examination and adjustment of a transit-instrument; 57. To determine the exact place for a meridian mark; 58. On the errors of the transit-instrument in connexion with a clock or chronometer; 59. The Moscow transit-instrument; 60. The Greenwich transit-instrument; 61. Observing and registering transits; 62. Reduction of observed transits into mean right ascensions; 63. On the correction of right ascension common to all stars; 64. Transit-circle by Troughton; 65. Reduction of the apparent zenith distance to the mean polar distance; 66. Ramsden’s altitude and azimuth circular instrument; 67. The Westbury altitude and azimuth circle; 68. The South Kilworth altitude and azimuth circle; 69. The collimator; 70. On the uses of a portable altitude and azimuth circular instrument; 71. A new portable altitude, azimuth and zenith instrument; 72. The Greenwich mural circle; Chs. 72-104; Plates.

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