INDEX 



233 



Metabolism, 14 



Mice, 73; California deer-, 153; 

 white, 60, 156 



Mind, 67, 183; and thyroid, 181 



Mitochondria, 83 



Mneme theory, 139 



Mocking birds, 69 



Modifications, 5Q, 64 



Molluscs, 61 



Monkeys, Mona, 162 



Montgomery, T. H., 26, 31 



Moore, J. E. S., 161 



Morgan, T. H., 38, 80, 83, 93 



Morphine, 205, 207 



Moth, willow, 222 



Mule, 84 



Muller, H. J., 58, 98, 143 



Mutant, abnormal abdomen, 94; 

 wingless, 73 



Mutations, 6, 57, 127, 143, 163, 

 175, 223, 228; cause of, 132; 

 and acquired characters, 145; 

 cumulative, 130, 131; degree 

 of, 128; definition, 148; and 

 environment, 74, 146; expla- 

 nation of, 132; importance 

 and effects, 130; of eye, 101; 

 gene, 74; kinds of, 170; re- 

 verse, 128; and selection, 130; 

 somatic, 101; usefulness of, 

 144 



Mutation theory, 127, 164 



Mutilations, 63 



Nageli, Carl von, 131 

 Narcotics, tolerance for, 205 

 Natural selection, 6, 70, 112, 



227; criticism of, 126 

 Neo vitalism, 110 

 Newman, H. H., 131 



Novelty in organisms, 165 

 Nucleus, as controlling center, 

 78; and cytoplasm, 78; com- 

 pared with germ plasm, 87; 

 necessity of, 82 



Oenothera^ 128 



Opportunism, 179, 193 



Organic selection, 116 



Organism, 47, 202, 210; adjust- 

 ment of, 196; capacity for 

 change, 134; complexity of, 

 16; constancy of, 194; inde- 

 pendence of environment, 16; 

 limitations of, 206; multi- 

 cellular, 28; product of herit- 

 age and environment, 22; 

 source of energy, 15; tendency 

 to be constant, 92 



Orthogenesis, 6, 131 



Osbom, H. R, 9, 55, 116, 161, 

 194 



Overproduction, 118 



Oxygen, 36 



Palaeontology, 164, 216 

 Pancreas, 10 

 Pangenesis, 139 

 Panmixia, 115 

 Papilio ajax, 72 

 Paramecium, 192 

 Parasitism, 20 

 Parental care, 178 

 Parthenogenesis, artificial, 37 

 Patterson, J. T., 101 

 Pawpaw butterfly, 72 

 Pentadactyl appendage, 166, 217 

 Peromyscus municulatusy 153 

 Petrunkevitch, A., 37, 98 

 Pharyngeal pouches, 215 



