Gemini, the Twins, constellation of, 63, 176. Geometrical figures, 195. Gibbous Moon, 93. Girl in the Moon, 147. Gravitation defined, 59. Great Bear, 5. Great Square of Pegasus, constellation of, 17. Greek alphabet, 197. Greenwich time, 86. Grimaldi on the Moon, 94, 147. Guardian stars of the Little Dipper, 16. Handbook of Boy Scouts, 193. Harvest and Hunter’s Moon, 98. Heat, how it travels, 123. Heat, what it is, 122, 129. Heliograph, how to make and use a, 40, 41. Horizon, a good, 153. Horizon glass, 84. Horizontal line defined, 194. Horoscopes, astrologer’s, 180. Horse and Rider, 11. Hours, dividing a circle into, 157. How a camera is made, 185. How the cave man marked time, 152. How the eye sees, 127. How to find, Aries, the Ram, 174. a comet, 113. constellations of the Zodiac, 169. focus of a lens, 133. longitude 86. the North Star, 83. with dipping needle and protractor, 82. with sticks and pail of water, 83. power of a telescope, 143. How to get Sun time, 153. How to know, the stars, 14. you are at the North Pole, 87. How to look at the Sun, 148. How to make, a cheap telescope, 140. pinhole telescope, 138. simple compass, 77. simple dipping needle, 79. star finder, 1. star trails, 187. How the Moon makes the tides, 99. How a photograph is made, 185. How a prism bends light, 133. How to read the almanac, 182. How a spectroscope is made, 191. How the stars shine, 121. How the stars were made, 119. How a telescope works, 139. How to tell, time by the Big Dipper, 12. a true meteorite, 117. How time is sent, by telegraph, 163. by wireless, 165. How to use a prism, 188. How we see light, 126. Hyades in Taurus, 175. Hyperbola, 113. Imaginary Sun time, 155. Index mirror, 84. Invisible stars, 206. Jupiter, 47, 61. nine moons of, 52. seeing, 51. through a telescope, 149. Kullmer star finder, 209. Latitude, how to find, by protractor and dipping needle, 82. with sextant, 84. with sticks and pail of water, 83. Lens, concave, 134. convex, 133. how to find focus of a, 133. Leo, the Lion, 177. Libra, the Balance, 178. Light, defined, 122. how made, 122. how it passes through glass, 130. how it travels, 123. how we see it, 126, 129. reflection of, 131, 132. refraction of, 132. speed of, 188. what makes the colors in, 123. wave-lengths of, 123, 130. Little Bear, constellation of, 16. Little Dipper, constellation of, 15. Local time, 86, 155. Longitude, how to find it, 86. meridians of, 86. use of sextant to find, 84. Lyra, the Lyre, 201.