CONtENTS. 



33. 

 34. 

 35. 

 36. 



41. 

 42. 

 43. 

 44. 



Lesson. Page. 



32. Different Kinds of Lenses. Burning Glass, - 69 

 Mirrors. Convex Reflectors, - - - - 71 



Colours. The Prism. - " " " P 



The Rainbow, Halo, and Parhelia, - - - 75 

 Structure of the Eye. Angle of Vision, - 78 



37. Optical Instruments. Spectacles. Microscopes, 81 



38. Microscopic Discoveries, - - * - 83 



39. The Telescope and Telegraph, - ^ - 86 



40. Astronomy. Progress of this Science, - - 88 

 The Solar System. Galileo, - _ - 91 

 The Sun, a magnificent habitable globe, - - 93 

 Mercury and Venus, - - - - 95 

 The Earth, Ecliptic and Zodiac. Celestial Lati- 

 tude and Longitude, - - - - 97 



45. Day and Night, causes of, - - - - 100 



46. Changes of the Seasons, - - - - 102 



47. The Moon. Harvest Moon, - - - - 104 



48. The Tides, explanation of, - - - 107 



49. Eclipses of the Moon and Sun, _ - - 108 



50. Mars, Vesta, Juno, Pallas, and Ceres, - * 111 



51. Jupiter, — his Belts, Satellites, &c. - - - 113 



52. Saturn, and Uranus. Saturn's Ring, - - 114 

 Comets. Pope Callixtus, - - - 115 

 The Fixed Stars. The Milky Way, - - 117 

 The Constellations. Hymn to the North Star, 119 

 Forms and Divisions of Time. Equation of Time, 122 



57. The Planetary System, - - - - 125 



58. Chemistry, Importance and Use of, - - 127 



59. General Principles of Chemistry. Chemical Af- 

 finity, -..--. 128 



C-aloric. Thermometer, - - - - 130 

 Atmospheric Air, Composition of Oxygen. Nitro- 

 gen, - 133 



Water, Composition of Hydrogen Gas, - - 135 

 The Earths and Alkalies. Uses of Lime, - 137 



Acids and Salts. Mountains of Salt, ^ - 140 

 Simple Combustibles. Carbon. Metals, - 143 



66. Oxyds and Combustion. Exhilarating Gas, - 145 



67. Electricity. Electrical Machine. Experiments, 148 



68. Leyden Phial. Dr. Franklin's Discovery. Thun- 



der and Lightning, - - - 152 



53. 

 54. 

 55. 



56. 



60. 

 61. 



62. 

 63. 

 64. 

 65. 



