326 INDEX 



Morganism, 210 

 Morphology, 292 

 Motility, 41 



organs of, 43 

 Motor habit, 151, 153 



mechanisms, 44 

 Multicellular organisms, 30 

 Muscle, 74, 76 



and energy, 75 



mechanisms, 76 



nerve-preparation, 140 



tissues, 48 

 Mutations, 246, 306 



causes of, 249 



and improbability, 251 

 Mutilations, 259 



Natural selection, 253, 258, 280 

 Natural things, classes of, 3 



defined, 3 



and energy, 5 



organisms as, 3 



status of, 4 

 Nature, passage of, 4 



organic theory of, 9 

 Nerve cells, 108 

 Nerve centres, no 

 Nerve terminations, 46 

 Nerves, 107 

 Nervous energy, 118 



system, 46 

 Neurones, 108 



patterns of, 153 

 Night-blindness, 230 

 Normality, 139, 155 

 Nucleic acid, 204 

 Nucleus in development, 208 

 Nutrition, ambiguous, 79 



bacterial, 79 



holophytic, 78 



holozoic, 78 



organs of, 44 



saprophytic, 79 



saprozoic, 79 



Ontogeny, 289 

 Oosphere, 180 

 Orders, 222 



Organ-anlagen, 195 

 Organisms, categories of, 29, 226, 

 242 



characteristics of, 10 



chemical structure, 21 



energetics of, 92 



and environment, 13, 16 



morphology of, 29 



physical status of, 15 



ultramicroscopic, 32 

 Organogenesis, 195 

 Organs, 43 



circulatory, 45 



effector, 47, 112 



locomotory, 43 



nervous, 46 



nutritional, 44 



receptor, 161 



respiratory, 45 



sex, 180 

 Oscillators, 58 

 Ova, anisotropic, 201 



equipotential, 200 



isotropic, 201 

 Ovaries, 177 



Ovum, segmentation of, 192 

 Oxygen-carriers, 84 



Pain, 118 

 Paleontology, 294, 298 



sequences, 299 



time scale, 318 

 Pangenesis, 207 

 Parasites, 42 

 Parthenogenesis, 185 

 Pedal mechanisms, 71 

 Perception, 114, 129 

 Persistent types, 289 

 Photosynthesis, 80 

 Phototaxis, 142 

 Phototropism, 141 

 Phyla, 222, 286 

 Phylogenies, 42, 293, 307 



of chordata, 314 



of fishes, 301 



of horse, 300 



of structure, 54 

 Play, 158 



