328 



INDEX 



Wheat, artificial crossing of, 69, 71 



awns in wheat, 85 



blooming in, 69 



breeding, 134, 135 



chaff characters, 84 



classification of species, 77 



disease resistance, 85, 87, 134 



FI crosses, vigor, 43-45 



flower structure, 34, 70 



hardiness in, 87 



improvement by crossing, 134 



Kanred, 76, 128 



linkage in crosses, 79, 80, 84 



Marquis, 136 



natural crosses in, 34-36 



Polonicum crosses, 79 



Red Rock, 128 



seed characters, 81-84 



size characters, 88 



species crosses, 77, 78 



spike density, 81 



sterility in species crosses, 79 



T. dicoccoides, wild, 78 



wheat-rye crosses, 35, 106 

 White, endosperm characters, maize, 

 186 



fruit, origin, and antiquity of, 

 261 



inheritance in pea, 236, 239, 240 

 Wichura, species crosses, willow, 8 



Wight, potato species, 219 

 plum species, 262, 265 

 Williams, ear-to-row, maize, 198 

 selection for stiff straw, wheat, 



129 

 Williams and Welton, ear characters 



and yield, maize, 197 

 varietal crosses, maize, 203 

 weight of seed planted and 



yield, 124 



Wilson, inheritance, potatoes, 222 

 Wilson and Warburton, cotton spe- 

 cies, 175 



Witte, timothy breeding, 212 

 Wittmack, origin of potatoes, 220 

 Wolf, seed size increase due to cross, 



maize, 201 

 Wood and Stratton, checks in 



correcting yield, 53 

 probable error by pairing 

 method, 58 



X 



Xenia in barley, 103 

 in maize, 183 

 in rice, 37 

 in rye, 106 

 law in maize, 184 



