Index. 



297 



Mulching, tends to prevent 

 drought, 144; transplanted 

 stock, 250. 



Muriate of potash, 157. 



Names, scientific, why used, 19. 



Nitrates in the soil, sources 

 of, 154. 



Nitrification, 154, 155. 



Nitrogen, 154, 155; in proto- 

 plasm, 45; in rain and snow, 

 155; sources of, in plant, 45; 

 stimulates growth, 152. 



Nodes defined, 80. 



Northerly exposure least try- 

 ing to plants in winter, 129. 



Notching, 253, 265. 



Nursery trees benefited by 

 transplanting, 76. 



Oats, treatment of seed for 

 prevention of smut, 181. 



Objects of grafting, 220; of 

 pruning, 256. 



Oedema in plants, caused by 

 excessive watering, 139. 



Onion mildew, 182. 



Optimum defined, 25. 



Orange rust, 180. 



Organic manures, partially de- 

 composed, act more promptly 

 than fresh ones, 155. 



Organic matter, importance of, 

 in soil, 69. 



Osmosis defined, 61. 



Ovary, 97. 



Overbearing should be pre- 

 vented, 105. 



Ovule, 97. 



Oxygen, essential to germina- 

 tion 26; necessary to life of 

 roots, 66; source of, in 

 plants, 44. 



Oyster-shell bark-louse, 168. 



Packing plants for transporta- 

 tion, 239. 

 Pales, 100. 

 Palets, 100. 

 Palisade cells, 49. 



Parasites, animal, 160; defined. 

 21; flowering or phaneroga- 

 mic, 178; funguous, 179; In- 

 jurious, 159; vegetable, 178. 



Parenchyma, 51. 



Paris green, 164. 



Pear, blight of, 180, 266. 



Peeling the stems of trees, 

 57, 265. 



Perfect flowers, 102. 



Persian insect powder, 166. 



Petals, 96. 



Phosphorus, 157; part played 

 by, in plants, 45. 



Picturesqueness, pruning for, 

 258. 



Pinching defined, 252; stimu- 

 lates branching, 82; to pro- 

 mote flowering. 263. 



Pistil. 97. 



Pith, 52. 



Plant food, elements in, 44; ele- 

 ments of, likely to be defi- 

 cient, 45; from soil must be 

 dissolved by soil water, 44; 

 in soil, reduced by crop 

 growing, 153; sources of, 43. 



Plant improvement, how ex- 

 plained, 270. 



Planting, too close, causes de- 

 ficient light, 148; trees, direc- 

 tions for, 242 245; with ref- 

 erence to chance crossings, 

 279; with reference to polli- 

 nation, 103. 



Plantlet, inner structure of, 48; 

 may need help to burst seed- 

 case, 34 ; principal parts of, 

 41; vigor of, proportionate to 

 size of seed, 38; visible in 

 seed, 40. 



Plant life, round of, 22, 116. 



Plant manipulation, 189; pro- 

 pagation, 189. 



Plant, directions for lifting 

 the. 237; removing the, 239. 



Plant tissues, brittleness of, 

 60; killed by drying, 144; 

 toughness of, caused by 

 drought, 143. 



