538 



INDEX 



Nettleship, hereditary cata- 

 ract, 198, 199, 499 



Neural plate, groove, tube, 28, 

 29 



Neuritis optica, sex-linked, 396 



Neuropathy, 395 



New England families dying 

 out, 435 



Newton, 474 



Night blindness, sex-linked, 396 



Nilsson-Eiile, multiple factors, 

 281, 282, 499 



Notochord, S9 



Nuclear coBiiELATioirs, 162 



Nuclear division, indirect, HI, 24, 

 110, lis, 113, 114, 115, 116, 

 mo, 122, 123, 125, 126 



Nuclear inheritance theory, 162- 

 167 

 , Nucleus, 10, 109, 113 

 V and cytoplasm concerned 



in heredity, 177, 179 



NuUiplex character, 249 



Obesity inherited, 203 

 Observations ok inheritance, 



191 

 "Odd" chromosome, 140 

 Oenothera, mutants, 392, S9S 



chromosomes of, 392 

 Oneness of life, 5, 47 

 Ontogeny and Phylogeny, 7, 302 

 Oocytes, 129 



of rabbit, 130 

 Oogenesis of Ancyracanthus, 



ISj 

 Oogonia, 138 

 Oosperm, 13, 16 



double cell, 18 



individuality of, 18, 19, 22 



infection of, 201 

 Organ-forming substances, 84 



in Styela, Amphioxus, frog, 

 118, 119 

 Organism of humanity, 489 

 Organization, 10 

 Organogeny, 28 

 Origin op Sex Ceees, 126-138 



Division period, 128 



Primitive sex cells, 128 



Oogonia, 128 



Spermatogonia, 128 



Growth period, 129 



Oocytes, 129 



Spermatocytes, 129 



Maturation period, 135 

 Orthogenesis, 305 

 OsBORN, Cartwright Lectures, 



398, 499 

 Otosclerosis, 200, 296 

 Ovaries, transplanted, 343-5^6 

 Ovipaeity, 30 



Oviparous development, 18, 19 

 Ovules, 13 



Oxychromatin, differential dis- 

 tribution, 184 



in cell body, 181 



"Pangenes" of deVries, 100 

 Pangenesis, hypothesis of, 92, 



335 

 Paramecium, avoiding reaction, 



behavior of, 61 



reactions to heat and cold, 

 53 



races differing in size, 198 



races of, 305 



rapid breeding of, 390 



selection in, 378 



trial and error, 63 

 Parthenogenesis, 108 

 "Particulate" inheritance, SOS 

 Partition walls between cells, 



185 

 Pasteur, 474 



Pathological characters in- 

 herited, 199-202 

 Pearl, action of selection, 379, 



500 

 Pearl and Parshley, modifica- 

 tion of sex ratio, 149 

 Pearson, ancestral inheritance, 

 216 



albinism in European fam- 

 ily, 2.92 



albinism in Papuan family. 



