528 



INDEX 



NETTLESHIP, hereditary cata- 

 ract, 198, 199, 499 

 Neural plate, groove, tube, 28, 



Neuritis optica, sex-linked, 296 



Neuropathy, 295 



New England families dying 



out, 435 

 NEWTON, 474 



Night blindness, sex-linked, 296 

 NILSSON-EHLE, multiple factors, 



281, 282, 499 

 Notochord, 29 

 NUCLEAR CORRELATIONS, 162 

 Nuclear division, indirect, 21, 24, 



110, 112, 113, 114, 115, 116, 



120, 122, 123, 125, 126 

 Nuclear inheritance theory, 162- 



167 

 Nucleus, 10, 109, 113 



and cytoplasm concerned 



in heredity, 177, 179 

 Nulliplex character, 249 



Obesity inherited, 203 

 OBSERVATIONS ON INHERITANCE, 



191 



"Odd" chromosome, 140 

 OENOTHERA, mutants, 392, 39S 



chromosomes of, 392 

 Oneness of life, 5, 47 

 Ontogeny and Phylogeny, 7, 302 

 Oocytes, 129 



of rabbit, 130 

 Oogenesis of Ancyracanthus, 



134 



Oogonia, 128 

 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 OF SEX CELLS, 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, 343-3^0 

 OVIPARITY, 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, 



eg 



behavior of, 61 



reactions to heat and cold, 

 53 



races differing in size, 198 



races of, 205 



rapid breeding of, 290 



selection in, 378 



trial and error, 63 

 Parthenogenesis, 108 

 "Particulate" inheritance, 208 

 Partition walls between cells, 



185 



PASTEUR, 474 



PATHOLOGICAL CHARACTERS IN- 

 HERITED, 199-202 

 PEARL, action of selection, 379, 



500 



PEARL AND PAHSHLEY, modifica- 

 tion of sex ratio, 149 

 PEARSON, ancestral inheritance, 

 216 



albinism in European fam- 

 ily, 292 



albinism in Papuan family, 



