244 



INDEX 



Malus, E. L., 100 



Margenau, H., 56 



Marx, K., 82, 226 



Mass, definition of, 89 



Mass action, law of, 131 



Mass energy relation, 115 



Mass spectrograph, 108, 139 



Maxwell, J. Clerk, 101, 113 



Mayer, Julius, 94 



Mayow, John, 152 



Mechanics, beginnings of, 78, 88 



laws of, 92 

 Medici brothers, 85 

 Mees, C. E. K., 186 

 Mellon Institute, 176, 214, 215 

 Mendel, Gregor, 63, 148, 159, 160, 



161, 162, 165 

 Mendeleev, D. I., 134 

 Mendelism, 165 

 Mensuration, early, 88 

 Menzel, D., 139 

 Mercury, perihelion of, 114 

 Metallurgy, 41 

 Meteorology, science of, 45 

 Michelson, Albert, 113 

 Michelson-Morley experiment, 114 

 Microincineration, 156 

 Micro-organisms, 166 

 Microscope, invented, 78, 83 

 Middle Ages, 67 

 Midwest Research Institute, 216 

 Migration, effect on civilization, 36 

 Mirbel, 153 

 Mohl, Hugo, 154, 155 

 Molecules, 122 



motion of, 94 

 Monasteries, 74 

 Mond, Ludwig, 217 

 Moon observed by Galileo, 79 

 Morgan, T. H., 160, 161, 181 

 Morgan, William, 104, 106 

 Morley, Edward, 114 

 Morphology, 156 

 Moseley, H. G. J., 137, 138 



Motion, laws of, 88, 89, 92 



Mount Wilson Observatory, 177 



Miiller, Johannes, 166 



Muller, H. J., 165 



Museum at Alexandria, Egypt, 144 



Mutation, 165 



Niigeli, Karl, 155, 158 



National Physical Laboratory, 176 



National Research Foundation, 



185 

 Natural selection, 145, 165 

 Nature, existence of, 58 

 Nebulae, 117, 118 



Andromeda, 117 

 Needham, J., 38, 149 

 Nela Park Laboratory, 180 

 Neolithic period, 23, 24, 40 

 Neon isotopes, 108 

 Neoplatonism, 74 

 Neptune, discovery of, 116 

 Nernst, W., 131 



Newton, Sir Isaac, 20, 52, 55, 58, 

 61, 67, 69, 72, 84, 85, 86, 

 90, 91, 92, 96, 97, 98, 100, 

 119, 138 



laws of, 89, 92 

 Nezv York Times, 198, 199 

 Nordenskiold, E., 144 

 Nova, observation of, 78 

 Nuclear physics, 140, 180 

 Nuclei of atoms, 140 

 Nucleus, cell, 154 

 Nuffield College, Oxford, 211 



report of, 217 

 Nutrition, 169 

 Nutting, P. G., 210 



Observations, 51 

 Observer, interest of, 52 

 Oersted, H. C., 103, 104 

 Oken, Lorenz, 153 

 Oliver, F. W., 232 

 Onnes, Kamerlingh, 181 



