Index 



Pisum, 176, 446. 



Pollen germination, experiments on, 

 276-281, 288, 289, 304; figures 

 showing, opp. 292. 



Pollination, effect of, on abscission 

 of corolla, 388, 417; on time be- 

 tween anthesis and flower-fall, 

 389; premature, 433; self, efforts 

 to secure artificially, 433-434. 



Pollination, Controlled, in Nicotiana, 

 429; method and technique of ex- 

 periments, 430; results of, 431. 



Populus, 350, 352. 



Potassium, used in nutrition experi- 

 ments on Nicotiana, 284. 



Quantitative characters, inheritance 

 of, 459, 513, 514-516. 



Quantitative Studies of Inheritance 

 in Xieotiana Hvbrids, b~, 169, 

 223. 



Eaces in Nicotiana Tahacum, 458-459, 

 491. 



Eeaction svstem contrasts in hered- 

 ity, 301, 313. 



Residual heredity in Tahacum, 515- 

 516, 520. 



Bicinus, 351. 



Rigor, in relation to poisonous gases, 

 445. 



Bustica, section, 11-12; types of, 12- 

 19. 



Salix, 350, 352. 



Salpichrora, 367. 



rhomboidea, 366, 398, 399, 411. 



Salpiglossus, 367. 



sinuata, 366, 398, 399, 411. 



Salvia, 350, 352. 

 splendens, 444. 



Scliilolysis, 353. 



Seeding character of Nicotiana hy- 

 brids, 193. 



Segregation, in Nicotiana hybrids, 

 192, 196, 247, 312-313, 459-460, 

 and passim. 



Separation cells, definition of, 349; 

 in Nicotiana, 352. 



Separation layer, definition of, 349; 

 position of, 350; origin of, 351, 

 368; cytology of, 352; predeter- 

 mined location of, 415. 



Separation zone, definition of, 349; 

 development of, 367-369; figure 

 showing, 368. 



SessilifoJia, derivatives, 475, 480, 485; 

 X mncrophyJla, 487 ; X auricu- 

 lata, 489. 



Setchell, W. A., 1, 457. 



Soil conditions, factor in abscission, 

 416. 



Solanaceae, Abscission of Flowers 

 and Fruits in, 347, 359. 



Solanum jasminioides, 366, 398, 411. 

 marginatum, 366. 

 nigrum, 352, 366, 398, 399. 

 tuberosum, 350, 351, 366, 367, 411, 



412. 

 umbeUiferum, 366, 398, 411. 

 verbascifolium, 366, 371, 398, 399, 

 411. 



Sprengel, cited, 19. 



Stenophylla, derivatives, 474, 475-476, 

 484, 485 ; X auriculata, 490. 



Sterility, Partial, of Nicotiana Hy- 

 brids Made with N. sylvestris as 

 a Parent, 189, 193, 273. 



Style, abscission of, in Datura, and in 

 Nicotiana, 384-385, 413; effect of 

 removal of, on abscission, and on 

 time of flower-fall of corolla, 

 388-389. 



Sugar, influence of amount of, dur- 

 ing abscission, 381. 



Sulfuric acid treatment in germina- 

 tion of tobacco seed, 199, 200, 

 203, 209, 219, 220. 



Taxonomic problems in Nicotiana Ta- 

 bacum, 461. 



Temj>erature, influence on abscission 

 time, 397, 409, 414, 416; contrib- 

 uting factor in germination of 

 tobacco seed, 451. 



Teratological forms in Tabacum, 513. 



Thomas, Mrs. R. H., production of 

 parthenogenetic seed in Nicotiana, 

 249. 



Tobacco smoke. See Narcotic vapors. 



Turgor. See Cell turgor. 



Turkey, tobacco seeds from, 5. 



"Unit character" conception in stu- 

 dies of heredity, 174-186; bearing 

 of, on flower size question in 

 Nicotiana hvbrids, 175; physio- 

 logical, 177-181, 197. 



Vegetative reproduction in Nicotiana, 

 197. 



Verhascum, genus, 357. 



Viability of seed, 209-215, 220, 233, 

 240,' 246, 263, 453, 454. 



Vitis, 350. 



White, O. E., cited, 521. 



White tobacco, 7-8, 233; plate show- 

 ing, opp. 40, 461. 



[588] 



