356 



THE THEORY OF THE GENE 



Muller, 112. 



mutant characters, 59-71. 

 mutation theory, 67, 68, 95. 

 Myxine, 265. 



N 

 Nachtsheim, 145, 231. 

 Nansen, 265. 

 Narcissus, 124. 

 Nematodes, 206, 231. 

 Newell, 237. 

 Nicotiana, 96, 143, 144, 192, 193, 



249. 

 nightshade, 112-116. 

 non-disjunction, 53-55. 

 notch wing, 77-81. 







oats, 150. 



Oenothera, 105, 131, 132. 



0. franciscana. 111. 



0. gigas, 70, 109, 110. 



0. Lamarckiana, 69, 71, 109, 110, 



172, 187, 188. 

 0. lata, 172-174, 189. 

 0. semilata, 172, 189. 

 Oguma, 205. 

 Oligarees, 281. 

 Ono, 212. 

 opossum, 205. 

 Osawa, 169. 

 Overeem, van, 131. 



Painter, 203, 204. 

 pangenesis, 28. 

 Papaver, 171, 197, 198. 

 parabiotic twins, 286. 

 particulate theory of heredity, 26- 



31. 

 pea comb, 72, 73, 74. 



pea, edible, 2, 7-10, 36, 37. 

 pea, sweet, 10, 11. 

 Peltogaster, 263. 

 Percival, 151. 

 Perla, 266-268. 

 Pfliiger, 267, 272. 

 Philippi, 266. 

 Phragmatobia, 105, 211. 

 Phylloxerans, 228-230. 

 physiological units, 28. 

 Pick, 260. 

 Pieris, 304. 

 pigs, 260. 

 Planaria, 44. 



planarian crossing-over, 43. 

 Plantago, 171. 

 Platanthera, 171. 

 Poinsettia, 177, 181, 182. 

 pollen grains, 10. 

 polyploid roses, 158-165. 

 Polyploids, 150-171. 

 Ponse, 278-280. 

 poppy, 197, 198. 

 poultry, 207. 

 Prange, 260. 

 Primula sinensis, 112. 

 Pritchard, 287, 288. 

 Protenor, 200. 

 protonema, 126. 

 Punnett, 10, 17, 36. 

 Pygaera, 136, 137, 198, 211. 



R 



rabbit, albino, 74. 

 rabbit, black, 75. 

 rabbits, 296, 301. 

 radium, 139. 

 Rana, 269-276. 

 raspberries, 171. 

 rats, 74, 296-298, 309. 

 recessive characters, 74. 



