INDEX 



Ice, 9, 138, 142, 145 



glaciers, 35, 36 



sheet, 37 



Inorganic (see substances) 

 Insecta, 270 



Insects, 276, 283 

 Inventions, 2 

 Iron oxide, 210 

 Irrigation, 80, 81 

 Isobar, 184 

 Isotherm, 184 



Kinetic theory, 125 



Lakes, 32, 46 



Larva, 280 



Latitudes, 174 



Lava, 49 



Leaves, 244 



Lenses, 226 



Lever, 112, 114 



Light, i, 4, 165, 216-224 



absorption, 221 



diffusion, 223 



form of energy, 216 



intensity, 229 



rainbow, 220, 225 



rays, 222 



refraction, 222, 226 



reflection, 222, 227, 228 



solar, 172 



spectrum, 220 



translucent, 224 



transmission, 224 



transparent, 224 



waves, 217, 219 

 Liquid, 3 

 Longitude, 274 



Mammals, 270 



orders of, primates, 272 



rodents, 272 



ungulates, 272 

 Man, 273 



Matter, 9 (see substances) 

 Mercury, 59, 60, 61, 62, 128 

 Meridians, 175 

 Metamorphosis, 280 

 Microscope, 227 

 Minute, 175 



Molecular motion, 139, 140, 141, 163 

 Molecules, 12, 13, 155-160 

 Monsoons, 187 



Moraines, 38 



Motion, 218 (see kinetic theory) 



Mountains, worn down, 30 



rainfall, 191 



range, 51 



Natural science, i 



Nature, i, 2 



Newton, Sir Isaac (1642-1727), 120 



Night, 169, 174 



variation, 1 74 

 Nitrates, 160 

 Nitrogen, 43, 151, 152, 156 



importance to plants, 103, 104 

 Nutrition, 248 



Nutritive cycle, 236 



Oil, 53 



Orbit (of earth), 171 

 Organic (see substances) 

 Oxidation, 91, 160, 161, 238 

 Oxygen, 43, 151-160, 209 



Parallels, 174 

 Pascal (1623-62), 61 

 Photography, 227, 228 

 Photosynthesis, 229, 230, 238 

 Phlogiston theory, 210 

 Piston, 75, 76 

 Planets, 170 



axes, 1 70 



movements, 1 70 



revolution, 1 70 



rotation, 1 70 

 Plants, i 



algae, 249, 258 



annuals, 247 



effect of sunlight, 230 



fungi, 258 



perennials, 247 



pollen, 254 



reproduction, 248, 249 



stamens, 254 

 Polar regions, 169 

 Pollen, 254 



Pressure, low and high, 21 

 Proteins, 235 

 Protoplasm, 160, 232, 236 

 Pulley, 113 

 Pump, 55, 56, 57, 61, 66 



Quartz, 94 



