300 



INDEX 



Longitude, 181 

 Luminous bodies, 149 

 Lymph, 261 



M 



Machines, mechanical advantage 

 of, 188 



perpetual motion, 188 



pole, 195 



simple, 188 

 Magnetoscope, 195 

 Magnetism, 194 

 Magnetizing by induction, 197 

 Magnet, poles of, 195 

 Magnets, artificial, 194 



bar, 194 



horseshoe, 194 



natural, 194 

 Magnifying glass, 153 

 Mass, 39 



Matter distinguished from energy, 

 13 



indestructible, 16 



movements of, 18 



properties of, 15 

 Medulla oblongata, 246 

 Megaphone, 168 

 Melting point, 54 



points, table of, 61 

 Mendel's law, 229 

 Meridians, 181 

 Metals, fusible, 133 

 Meteorites, 10 

 Meter, 34 



cubic, 36 



divisions of, 35 

 Metric system, 33 



advantages of, 34 



ton, 36 

 Microscope, 153 



Milky way, 5 



Moisture in the air, 106, 119 



Molecular motion, 18 



theory, 13 

 Molecules, 13 



speed of, 18 

 Mollusca, 221 

 Momentum, 173 

 Monoecious plants, 218 

 Month, 11 

 Moon, 9 



full, 10 



new, 10 

 Mulch, 89 

 Muscles, 240 

 Mutants, 228 

 Mutation theory, 227 



N 



Names, scientific, 219 



vernacular, 219 

 Natural selection, 227 

 Nerves, 245 

 Night, 11 

 Noon, 182 

 Northern lights, 203 

 Nucleus of cell, 212 



Occlusion, 133 

 Opaque bodies, 16 

 Orders, 218 

 Organic bodies, 211 



kingdom, 213 

 Organs, 212 

 Osmosis, 115 



Oxidation, heat and light from, 72 

 Oxygen, activity of, 72 



need of, 271 



preparing, 75 



