CONTENTS XI 



CHAPTER PAGE 



XVII. Formation of proteins. Translocation and 



STORAGE OF FOODS . . . .217 



Formation of proteins, 217 ; Utilisation, translocation and storage 

 of plant-foods, 219 ; Nutrition of semi-parasites and semi-sapro- 

 phytes, 225. 



XVIII. Enzymes and the digestion of reserve- 

 materials ..... 227 

 XIX. Respiration ...... 233 



Ordinary respiration in the presence of free oxygen of the atmo- 

 sphere : aerobic respiration, 233 ; Anaerobic or Intramolecular 

 respiration, 238. 



XX. Growth ...... 240 



Growth, 240 ; Conditions which influence growth, 243 ; spontane- 

 ous movements of growth ; nutation and tissue-tension, 247 ; induced 

 movements of growth, 250. 



XXI. Reproduction . . . . .258 



Vegetative reproduction, 258; Cuttings, 259; Layers, 261; 

 Budding and grafting, 262. 



XXII. Reproduction {continued) .... 269 



Sexual reproduction, 269 ; Structure and germination of the 

 pollen-grain, 269 ; The ovule and its structure, 271 ; Fertilisation 

 and its effects, 273 ; Pollination ; Self-fertilisation and Cross- 

 fertilisation, 279 ; Transference of pollen, 281 ; Sexual affinity ; 

 hybridisation and hybrids, 285 ; Mendelian laws of inheritance, aSg ; 

 Artificial pollination ; methods of crossing plants, 299. 



. XXIII. Cultivated plants and their origin ; Plant 



BREEDING ...... 303 



Bud-varieties or ' sports,' 304 ; Variation among seedling plants, 

 305 ; Variations, how induced, 312 ; Correlated variability, 316 ; 

 Reversion, ' throwing back ' or atavism ; Degeneration of varieties, 

 317- 



PART IV. 



CLASSIFICATION AND SPECIAL BOTANY OF 

 FARM CROPS. 



XXIV. The classification of plants . . . 320 



Individual and species ; variety and race, 321 ; Genus ; plant- 

 names, 321 ; Divisions of the Vegetable Kingdom, 323. 



