356 



Index 



sex determination in Phylloxera, 

 166 



sex-linked inheritance, 180, 1S1, 

 184, 185 , 



rapid breeding of Drosophila, 115 

 Morgan and Bridges, modifying fac- 

 tors, 102 



lethal factors, 104 

 Morphological characters, 66. 



tests, 32 

 Mosaic development, 214 

 Moth and flame, 312 

 Mother and child, 26 

 Mott, insanity inherited, 71 

 Mouse, maturation and fertilization, 



139 

 Movements, within eggs and cleav- 

 age cells, 38, 135, 136, 142, 223 



effects of stopping, 223 



random, 43 



of spermatozoa, 38 

 Mulattoes, skin color, 108-110, 113 



in Tamaica, 284 



in U. S., 284 

 Muller, Johannes, 319 

 Muller, mutations of Oenothera,- 263 

 Muslow, 752, 75? 



Multiple factors, in oats and wheat, 

 107 



skin color, 108-110 



size, 110, in 

 Multiple sclerosis, 118 

 Musca, symmetry of egg, 797 

 Muscular atrophy, 118 

 Mutation Theory, 74, 262 

 Mutations, 73, 262 



and Fluctuations, 74, 262-265 



progressive and regressive, 268 



origin of, 262 

 Mutilations, not inherited, 229 

 Myopia, 69 



Nageli, idioplasm, 128 



non-inheritance of alpine habit, 

 234 

 Natural selection, 254, 257, 275, 296 



nullified, 278 

 Nature, definition of, 303 



man part of, 303 



mechanistic conception of, 302 



vs. nurture, 205 



stability of, 272 



voluntaristic conception of, 301 

 Necturus, behavior of, 51 

 Neo-Darwinism, 35 

 Neo-Lamarckism, 35, 235 

 Nettles hip, hereditary cataract, 66, 



67 

 Neural plate, groove, tube, 23 

 Neuritis optica, sex-linked, 118 

 Neuropathy, 117 



New England families dying out, 293 

 Newcomb, practical eugenics, 281 

 Newton, 317 



Night blindness, sex-linked, 118 

 Nilsson-Ehle, multiple factors, 107 

 Non-Mendelian Inheritance, 107 

 Notochord, 23 



Nuclear division, indirect, see Mitosis 

 Nuclear inheritance theory, 177 

 Nucleus, does not differentiate, 145 

 and cytoplasm concerned in 

 heredity, 198 

 Nulliplex character, 97 

 Nutrition and Development, 224 



Obesity inherited, 68 

 Observations on inheritance, 63 

 "Odd" chromosome, 157 

 Oenothera, mutants, 262-269 



chromosomes of, 268 

 Oneness of life, 3, ^6 

 Ontogeny and Phylogeny, 5 

 Oocytes, 148 



of rabbit, 750 

 Oogenesis of Ancyracanthus, 153 

 Oogonia, 148 

 Oosperm, 13 



double cell, 13 



individuality of, 13 



infection of, 113 

 Organ-forming substances, 59 



in Stylea, Amphioxus, frog, 142 

 Organism of humanity, 324 

 Organization, 6, 8 

 Organogeny, 23 

 Origin of Sex Cells, 148 



Divis t on period, 148 



Primitive sex cells, 148 



Oogonia, 148 



Spermatogonia, 148 



Growth period, 148 



Oocytes, 148 



