322 



HORTICULTURE FOR SCHOOLS 



Red-spider, citrus, 241 



illustrated, 240 

 Refrigeration, exercise, 276 



history of, 268 



limitations of, 269 

 Refrigerator car, 269 

 Relationships, plant, 5, 6 

 Reproduction, sexual, 39 

 Reservoirs, storage, 147 

 Resistance to frost, 12 

 Respiration and photosynthesis, 33 



in leaf, 32 

 Rhizoctonia, 256 

 Ring-budding, 76 

 Riparian rights, 151 

 Ripeness of oranges, how deter- 

 mined, 198 



process, 261 



Riverside, California, home of origi- 

 nal navel orange, 197 

 Roosevelt dam, 147 

 Root-cap, illustration and descrip- 

 tion, 21, 22 



crops, 92 



-cuttings, 59 



-grafting, 78 



-hairs, 22, 23 



-louse of grape, 220 



-rot, 256 

 Roots as storehouses, 23 



growing portions of, 34 



trimming of in nursery stock, 

 126 



tuberous, 63 



types of, 21, 34 



Rosa rugosa, propagation of, 59 

 Rose, family, members of, 180 



propagation of, 63 



tribe, 180 

 Rosette, a disease of the peach, 



185 



Round-headed borer, metamorpho- 

 sis of, 231 



Rubber plants, propagation of, 56 

 Runners, 57 



Rust-mite, pear-leaf, 243 

 Rutabaga, 99 



S 

 Saccharimeter for testing grapes, 



262-263 



Saddle-grafting, 81 

 Salt River Valley, 147 

 Sanderson, figures on insect injury, 



223 

 San Jose scale, 185, 238 



control of, 238 

 Saprophytes, defined, 247 

 Saturated atmosphere, 118 

 Savoy cabbage, 104 

 Scale insects, 237 



San Jose, 238 

 Sea-kale, 106 

 Seed dissemination, 44 



propagation by, 39 



resting period of, 45 



storage of, 45 



structure of, 39, 51 



testing, 48 



vegetable, 87 

 Selective absorption, 18 

 Self-fertile, 161, 175 



-fertility of Bartlett pear, 176 



-pollinated, 161 



-sterile, defined, 162 



-sterility of Bartlett pear, 176 

 Semi-hardwood cuttings, 63, 67 



-tropical fruits, 196 

 Sepal, illustrated, 158 

 Shallot, 102 



Shapes of plant-cells illustrated, 17 

 Shield-budding, 71 

 Shoot of grape, 217 

 Shot-hole fungus, 255 



remedies for, 256 



Shrubbery, grouping of, according to 

 height, 300 



how grouped, 298 

 Shrub planting, 299 

 Side-graft, illustrated, 82 



-grafting, 81 

 Sieve-tube, 24 



Size of fruits subject to variation, 12 

 Small-fruits, 206 

 Smyrna fig, pollination of, 203 



