INDEX 



359 



developed by Xilsson, Summary 

 of method, 90; discovered by 

 Darwin, Natural, 91; Explana- 

 tion of amelioration of agri- 

 cultural plants by, 99; for oil 

 and protein, 154; for strong 

 straw, Barley, 239; is intra-spe- 

 cific, 94; of corn, 134; of double 

 common stock, 238; of quinces, 

 239; of samples, 70; Hybridiza- 

 tion and, 202; of individuals, 

 71; in sugar-beets, 94; Natural, 

 and mutation, 9; Principle of 

 continuous, 90 ff. ; Principle of 

 natural, 2; Repeated, 150, 222; 

 Sufficiency of initial, 73. 



Selections, Burbank's, on large 

 scale, 167. 



Shasta daisies, 196, 198 fig. ; Bur- 

 bank's, 195 fig. 



Shirreff, Patrick, breeder of cer- 

 eals, 34- 



Shirreff 's bearded red wheat, 36; 

 bearded white wheat, 36; oats, 

 35- 



Shull, Burbank and De Vries, 165 

 %. 



Silene odontipetala, Seedling 

 plants of, 295 fig. 



Slow evolution, Nilsson on, 14; 

 Time required for, 4. 



Snapdragon and its color varie- 

 ties, 31 7 fig- 

 Society for Sweden, Seed-grain, 

 54- 



Solo pea, Svalof, 281 fig. 



Species among cereals, Elemen- 

 tary, 105; Constancy of elemen- 

 tary, 100; Elementary, of agri- 

 cultural plants, 29; Origin of, 

 92; Origin of elementary, 81; 

 Origin of, by mutations, 9, 26; 

 Scott on constancy of, 8. 



Splittings in hybrids, 316. 



Sports, 223; at Svalof, 89; at 

 Svalof, Cereal, 85. 



Spurs, Cause of, 241. 



Star - flower, Australian, 169 fig., 

 172; Improved everlasting Aus- 

 tralian, 171 fig. 



Statiotes aloides, 338. 



Stipa, 170. 



Stock, Common, 238. 



Stocks, Seeds of, 244. 



Svalof, Agricultural experiment 

 station at, 48 ff., 272; breeding 

 of cereals, 48; Bore-wheat, 267 

 fig. ; Concordia pea, 69 fig. ; flag- 

 oats, 76 fig.; Grenadier wheat, 

 266 fig.; Crop pea, 283 fig.; 

 method of producing improved 

 races, 67; oats, Stiff-branched, 

 82 figure; oats with bending 

 branches, 86 figure; oats with 

 spreading branches, 83 fig. ; oats 

 with weak branches, 87 figure; 

 Pearl summer wheat, 74 fig. ; 

 Solo pea, 28 1 fig. ; village, 50. 



Sweden, Seed-grain society for, 54. 



"Sweet Brotan" plum, 211. 



Syringa azurea plena, 188. 



Tannin, 248. 



Tarrytown canna, 200. 



Taste, Correlations between color 

 and, 248. 



Teasels, Torsions among, 142; 

 Twisted stems of, 144 fig. 



Tedin's work on peas, 255. 



Testing corn, Methods of, 137. 



Thistle, Napa-, 334. 



Thorn-apples, Color of, 246. 



Toadflax, Peloric, n, 12 fig. 



Tobacco, and petunia, Hybrid be- 

 tween, 219; Fragrant, 170, 209; 

 Pitcher-like leaf of, 291 fig. 



Torsions among teasels, 142. 



Trifolium incarnatum, 261. 



Triticum polonicum, 30 fig. 



Unit-characters, 16, 242, 309. 

 Units, 310. 



Variability, 3; Constancy of mi- 

 nor, 118; Correlations in fluctu- 

 ating, 289 ff.; Correlative, 332; 

 Fluctuating, 5, 100, 183; Hy- 

 bridization a means of increas- 

 ing, 186; Kinds of, 182; of the 

 cereals, Origin of, 84; of corn 

 within the varieties, 118; of ray- 

 florets, Fluctuating, 306; Pro- 



