Pallas, 84. Parabola, 51. Parallel lines, 25. Parallel of latitude, 94. Pellucid bodies, 157. Pencil of rays, 158. Pendulum, 98. Perihelion, 75. Perpendicular lines, 25. Phases, 109. Piston, 143, 145. Plane, 92, 93. Planets, 76, 81, 83. Poles, 92, 99, 100. Polar star, 100, 112. Porosity, 42, 126. Powers, mechanical, 54. Projection, 49, 50, 71. Precession of equinoxes, 107. Pulley, 54, 63. Pump, 31. sucking and lifting, 143. forcing, 144, 145. air, 31, 145. Pupil of the eye, 164. R. Rain, 17, 129. Rainbow, 188. Rarity, 16. Ray of light, 158, 179. reflected, 160, 161. incident, 161. Rays, intersecting, 165. Reaction, 39. Receiver, 31. Reflection of light, 160, 163. angle of, 45, 161, 173. of mirrors, 173. of plane mirrors, 174. of concave do. 174. of convex do. 174. Reflected motion, 43. Refraction, 179, 186. of the atmosphere, 182. of glass, 183. of a lens, 184. of a prism, 185. Resistance, 54. Retina, 165. image on, 166. Rivers, 134. Rivulets, 131. S. Satellites, 80, 111, 113. Saturn, 85. Scales, or balance, 55. Screw, 54, 67. Shadow, 110, 111. Siderial time, 106. Sight, 165. Signs of the zodiac, 86, 93. Smoke, 14, 29. Solar microscope, 202. Solstice, 100, 102. Sound, 151. acute, 155. musical, 155. Space, 33. Specific gravity, 123. of air, 140. Spectrum, 190. Speaking-trumpet, 154. Sphere, 26. Springs, 130. Spring tides, 116. Square, 81, 85. Stars, 77, 86, 102. Storms, 147. Substance, 10. Summer, 76, 100. Sun, 71, 75, 78, 162, 182. Swimming, 41. Syphon, 132. T. Tangent, 49, 73. Telescope, 203, 204. reflecting, 204. refracting, 204. Temperate zone, 92, 101. Thermometer, 142. Tides, 114, 116. neap, 116. spring, 116. ærial, 150. Time, 105, 107. siderial, 107. equal, 107. solar, 107. Tone, 155. Torrid zone, 93, 147, 182. Transit, 114. Transparent bodies, 157. Treble and bass, 155. Tropics, 92. V. Valve, 143. Vapour, 17, 29, 104, 129. Velocity, 33, 57. Venus, 84. Vesta, 84. Vibration, 98, 152. Vision, 164, 168. Vision, angle of, 168, 170. double, 171. U. Undulation, 153. Unison, 155. W. Water, 118, 130. spring, 130. rain, 130. level of, 120. Wedge, 54, 66. Weight, 23. Wheel and axle, 54, 65. Wind, 146. trade, 147. periodical, 148. Winter, 76, 101. Y. Year, 107. siderial, 107. solar, 107. Z. Zodiac, 86. Zone, 93. torrid, 93, 147, 182. temperate, 93, 101. frigid, 93, 100. THE END. TO ALL TEACHERS. SCHOOL BOOKS. SMILEY'S GEOGRAPHY AND ATLAS, and SACRED AND ANCIENT GEOGRAPHY FOR SCHOOLS. The above works will be found useful and very valuable as works of reference, as well as for schools. The Maps, composing the Atlases, will be found equal in execution and correctness to those on the most extensive scale. The author has received numerous recommendations, among which are the following: