INDEX 



317 



nitrates 55, 83, 117, 305 



nitrogen 30, 31, 32, 39, 55, 83, 105, no, 



114, 115, 117, 122 



pure culture of in 



nitrogen-gathering crops . . .105, no 



nutrients 309 



nutritive ratio 251, 270 



nymphs 210 



oats 71, 151 



okra 180 



one-crop system 100, 101 



onion 178, 179 



orange '. . . . 168 



orchard 166 



cultivation . 172 



fertilizing 173 



location 170 



pruning 174 



selection of varieties for . . 171 



spraying 173 



thinning fruit in 174 



oriole, Baltimore 227 



osmosis 38 



outbuildings 292 



ovary 43 



ovules 43 



oxygen . . .25, 27, 30, 31, 39, 40, 54 



Paris green 214, 307 



pasture grasses 134 



pasturing cattle 244 



peach 167, 170 



peafowls 270 



peanuts 138 



pear 167, 170 



peas no 



Canada field 138 



cow . 66, 102, 105, 108, 136, 137 



percolation 24 



perennials 44, 187, 196 



perfect flowers 50 



petal 42 



phosphoric acid 83, 115, 118, 122, 305 



phosphorus 30, 32, 83 



Pistil 43, 50 



plant breeding 74 



diseases ...,,,.. 199 

 families ..,,.,. 196, 127 



plant food 30, 31, 32, 37, 



air-derived .... 



necessary elements of 



soil-derived , 



39, 40, 54, 87, 

 I0 5> "5 

 39, 54 

 54 

 37, 55 



plant improvement 73, 75 



methods of 74 



reproduction from buds . 58 

 reproduction from seeds . 65 



planting, depth of 70 



soil, conditions for .... 70 



time of 71 



plants, girdling 48 



parts of 46 



strong-feeding 48 



weak-feeding 48 



plow 94, 287 



pan '96 



plowing . . 94, 219 



conditions of soil for ... 95 



depth of 89, 90, 95 



for drainage 88 



subsoil 96 



time of 94 



plum 168 



plumcot 75 



poisons, fungicides 206, 306 



insecticides 219, 307 



pollen 43, 74, 146 



pollen bearing 50 



by hand 51, 150 



by insects .... 51, 221, 275 



by wind 50 



pollination 51, 150 



ponies 256 



potash . . . .83, 118, 122, 173, 305 



potassium 30, 32, 83 



potato, sweet. . 63, 65, 1 60, 177, 178 

 white 60, 127, 160, 177, 178 



poultry 268 



care of 271, 272, 273 



diseases 272 



food 270 



products 268 



primus berry 75 



protein .... 238, 240, 241, 242, 243 



protoplasm . 41, 200 



pruning 174 



publications of Department of 



Agriculture . ... 309 



