374 



Index 



284, 285, 286. 

 sex chromosome, 169, 170, 184 



186, /p/ 



sex determination in Phylloxera, 



169 

 sex-linked inheritance, 185, 186, 



187, 188, 189 



rapid breeding of Drosophila, 116 

 MORGAN AND BRIDGES, modifying fac- 

 tors, 103 



lethal factors, 105 



Drosophila mutants, 284-286 

 Morphological characters, 66 



tests, 32 



Mosaic development, 223 

 Moth and flame, 330 

 Mother and Child, 26 

 MOTT, insanity inherited, 71 

 Mouse, maturation and fertilization, 



139 



Movements, within eggs and cleav- 

 age cells, 38, 755, 136, 142, 232, 



effects of stopping, 232 



random, 43 



of spermatozoa, 38 

 Mulattoes, skin color, 109-111, 114 



in Jamaica 301 



in U. S., 301 



MULLER, JOHANNES, 337 

 MULLER, mutations of Oenothera, 279 

 MUSLOW, 154, 157 



Multiple factors, in oats and wheat, 

 109 



skin color, 109-111 



size, in, 112 

 Multiple sclerosis, 118 

 MUSCA, symmetry of egg, 796 

 Muscular atrophy, 118 

 Mutation Theory, 74, 274 

 MUTATIONS, 73, 274 



AND FLUCTUATIONS, 74, 274, 277, 



in Drosophila, 280-286 



in Leptinotarsa, 281 



in Oenothera, 274, 286 



progressive and regressive, 282 



origin of, 280 



Mutilations, not inherited, 240 

 Myopia, 69 



NAGELI. idioplasm, 130 



non-inheritance of alpine habit, 



245 



Natural selection, 266, 272, 291, 292, 



nullified, 294 

 Nature, definition of, 321 



man part of, 321 



mechanistic conception of, 320 



vs. nurture, 213 



stability of, 289 



voluntaristic conception of, 319 

 NECTURUS, behavior of, 51 

 Neo-Darwinism, 35 

 Neo-Lamarckism, 35, 245 

 NETTLES HIP, hereditary cataract, 66, 



67 



Neural plate, groove, tube, 23 

 Neuritis optica, sex-linked, 119 

 Neuropathy, 118 



New England families dying out, 312 

 XEWCOMB, practical eugenics, 298 

 NEWTON, 335 



Night blindness, sex-linked, 118 

 NILSON-EHLE, multiple factors, 106 

 NON-MENDELIAN INHERITANCE, 106 



107 



Notochord, 23 



Nuclear division, indirect, see Mitosis 

 Nuclear inheritance theory, 179 

 Nucleus, does not differentiate, 145 



and cytoplasm concerned in her- 

 edity, 203 



Nulliplex character, 98 

 Nutrition and Development, 232 



Obesity inherited, 68 

 OBSERVATIONS ON INHERITANCE, 63 

 "Odd" chromosome, 158 



OENOTHERA, mutants, 274-279 



chromosomes of, 282 

 ONENESS OF LIFE, 3, 36 

 Ontogeny and Phylogeny, 5 

 Oocytes, 148 



of rabbit, 750 



Oogenesis of Ancyracanthus, 755 

 Oogonia, 148 

 Oosperm, 13 



double cell, 13 



individuality of, 13 



infection of, 114 

 Organ-forming substances, 59 



in Styela. Amphioxus, frog, 142 

 Organisms of humanity, 340 

 Organization, 6, 8 

 ORGANOGENY, 23 



