Index 



245 



Ontogeny, 83 

 Order of Nature, 9, 23 

 Order of Universe, 15 

 Owen, Sir Richard, 197 



Paludina, 96 



Pathology, 127 



Past in the present, 87 



Pavlov, 166 



Pearl, Raymond, 163 



Peripatus, 76 



Photosynthesis, 45 



, artificial, 46 



Phyllium, 136 



Phylogeny, 83 



Pigeons, evolution of, 94 



Planetesimals, 10 



Poincar6, 16 



Poultry, evolution of, 92 



Preparations for life, 27, 29 



Proteus, 148 



Protons, 18 



Punnett, 133, 222 



Radium, 18 

 Rats, 161, 162, 163 

 Rats on a roundabout, 166 

 Recapitulation, 81 

 Reflex actions, 157 

 Religion and science, 229 

 Religious wonder, 12 

 Rhythms, 156 

 Rock record, 57 

 Root-tubercles, 105 

 Rutherford, Sir Ernest, 20 



Salmon, 130 

 Saturn, 4 

 Schimper, 111 

 Schwalbe, G., 93 

 Sea-Lizards, 66 



Selection, 137 



Sex-hormones, 173 



Simpson, J. Y., 139 



Skene, MacGregor, 49 



Smith, E. A., 171 



Soddy, Frederick, 18 



Specificity, 83 



Spencer, Herbert, 120, 169 



Sphenodon, 54 



Spiracle of skate, 73 



Spontaneous generation, 47 



Starling, E. H., 172 



Stars, distance of, 14 



Stickleback, 129 



Stockard, C. R., 163, 165 



Struggle for existence, 117, 137 



Sun, distance of, 14 



Synthetic types, 75 



Tennyson, 20, 22 

 Tidal theory, 8 

 Tortoises, giant, 65 



i 



Uhlenhuth, 93 



Unit characters, 147 



Universe, circumference of, 15 



Uranium, 18 



Variability, 124 

 Variations, 125 

 Vestigial organs, 71 

 Virchow, 127 



Wallace, Alfred Russel, 63, 100 



Water, 26, 28 



Web of life, 101 



Wegener, 21 



Weismann, 150, 151 



Whale, 71 



Wiedersheim, R., 197 



Wild cat, 100 



