INDEX 



319 



"Mother of vinegar," 291 

 Mouth-parts and insect control, 227 



of butterfly, 226 



of insects, 226 



Movement of sap in trunk, 25 

 Muir, John, quoted, 4 

 Mulching of strawberries, 208 

 Muskmelons, 114 

 Mustard, 106 

 Mutation theory, 10 



N 

 Native vegetation an index to soil 



type, 120 



Natural lines in landscape-garden- 

 ing, 309 



selection, 8 



style in landscape-gardening, 308 

 Nature's plantings, 308 

 Navel orange, origin of, 197 

 Nectarine, 185 



on peach trees, 10 

 New Mexico, irrigation in, 143 

 Newtown Pippin apple, an out- 

 standing variety, 4 

 Nicotine-sulfate spray, 233, 240 

 Nightshade, deadly, 5 



exercise with, 14 



family, 4 



Nitrification, 130-131 

 Nitrogen as fertilizer, 129 



sources of, 129 



Nova Scotia, plums grown in, 187 

 Nozzles for spraying, 138 

 Nucleus, description of, 18, 19 



illustrated, 17, 19 

 Nursery stock, care of, 123 



trees, inspection of, 123 

 Nuts in North America, 191-195 



Oak, 305 

 Offsets, 63 

 Oil, olive, 202 



Oleander, propagation of, 56, 63 

 Olive, climatic requirements of, 201 

 history of, 201 



oil, 292 



pickles and oil, 202 



propagation of, 201 

 Onion, 99 



climate adapted to, 100 



flower, illustrated, 100 



insects, 101 



propagation of, 100 

 Ontario, Canada, as peach center, 



184 



Optimum temperature for germina- 

 tion, 47 

 Orange, cost of marketing, 288-289 



test for ripeness of, 263 



varieties differ in frost-resistance, 

 198 



Washington Navel, origin of, 197 

 Orchard, laying out and staking, 123 



management, 117 



patterns, 124 



trees, study of, exercise, 195 

 Origin of species, 8 

 Ornamental plants, use of, 297 

 Orthoptera, 225 

 Osier, propagation of, 56 

 Osmosis, exercise to illustrate, 36 



the process described, 22 

 Ovary, illustrated, 158 

 Ovule, illustrated, 158 

 Oxygen and seed germination, 47 



used by leaf, 32 



Packing-house operations, 265 



of fruit, exercise, 273 



purposes of, 265 

 Palisade-cells and photosynthesis, 33 



of leaf, 31 

 Pappus, 44 

 Parasitic insects, 238 

 Parenchymal cells, 31 

 Paris green, exercise, 244 

 Parsley, 95, 108 

 Parthenocissus quinquefolia, 302 



tricuspidata, 302 

 Patch-budding, 76 

 Patch, Edith M., 240 



