xvi CONTENTS 



CHAPTER XVII 



BREEDING OF VEGETABLES PAGE 



Self -fertilized vegetables 234 



Origin of vegetables 234 



Peas 236 



Some classification characters 236 



Inheritance 236 



Beans 241 



Some classification characters 241 



Inheritance 242 



Tomato 245 



Classification characters and inheritance 245 



Peppers . 246 



Classification characters and inheritance 246 



Methods of breeding self-fertilized vegetables 247 



Cross-fertilized vegetables 248 



Radish; origin, inheritance and breeding 249 



Beets; inheritance and breeding 250 



Cultivated vegetables of the genus Brassica 251 



Inheritance 251 



Breeding . ., 252 



Asparagus; rust resistance 253 



Economic Cucurbitaceae 254 



Introduction and classification 254 



Immediate effect of pollination . 256 



Cucumber 257 



Muskmelon. . 257 



Squashes and gourds 258 



Watermelon 258 



Breeding Cucurbitaceae 259 



CHAPTER XVIII 

 FRUIT BREEDING 



Origin and antiquity of some fruits .261 



Some early studies of fruit improvement 264 



Von Mons 264 



Knight -...../. ; 264 



American pomology 265 



Some considerations of fruit breeding . . . . . 265 



Overcoming soil heterogeneity 266 



Self-sterility and heterozygosity 267 



Inheritance of some characters 271 



Apple.. ....,'....'.- ."> * ;."-. 271 



Raspberry ....'.., 272 



Grape 272 



Illustration of methods of breeding 273 



Selection of bud sports 273 



Controlled crosses ' 277 



