INDEX 



255 



Nucleolus, 17 

 Nucleus, 17, 127 

 Nutrition of pot-plants, 70 

 Nutrition by aerial roots, 75 

 Nutrition of roots, 30 

 Nutritive substances, liow replaced, 

 52 



Ovary, 215, 226 

 Ovules, 216, 226 

 Oxygen, 31 



Oxygen, lack of, 'j^ 



Palisade parenchyma, 1 19 

 Paracorolla, 217 

 Parasites, 48 

 Parenchyma, 12, 109 

 Pectin substances, 123 

 Peeling of stems, 161 

 Pepsin, 123 

 Perianth, 214 

 Periblem, 218 

 Pericambium, 15 

 Permeability of soil, 61 

 Phla^m, 13 



Phosphoric acid, 42, 54 

 Phosphorus in plants, 32 

 Pinching, 138 

 Pit, bordered, 25 

 Pith, 95 

 Placenta, 228 

 Ploughing in of crops, 67 

 Pneumathodes, 80 

 Pollen grains, 2 1 5 

 Pollen tube, 227 

 Pollination, 239 

 Pollinia, 240 

 Potassium in soil, 41 

 Potassium as manure, 54 

 Pot-i)lants, nutrition of, 70 

 Pressure of bark, 104 

 Pricking out, 249 

 Primary meristem, 1 20 

 Primordial utricle, 17, no 

 Procambial strands, 99 

 Propagation by cuttings, 172 

 Propagation by layerings, 169 



Prosenchyma, 12 



Protandrous flowers, 239 

 I Proteids, 124 

 I Protein crystals, 125 

 I Protogynous, 239 

 j Protoplasm, 16 



Pruning for fruit, 142 

 I Pruning for wood, 142 

 I Pruning, how to increase effect of, 

 155 



Re-potting, 85 



Resins, 124 



Respiration of leaf, 109 



Respiration of roots, ']'], 207 



Respiratory cavity, 1 1 2 



Retentiveness of soil, 40 



Ringing, 159 



Root cap, 9 



Root cuttings, 182 



Root hairs, 5 



Root pressure, 20 



Root tip, 7 



Root tubercles, 48 



Roots, absorptive portion of, 4 



Roots, conducting portion of, 10 



Roots, how nourished, 37 



Roots, respiration of, 61 



Roots, structure of, 4 



Roots, treatment of, 81, 85 



Roots, upward growth of, 79 



Rubidium in plants, 36 



Salpetre, Chili, as manure, 54 

 Salt, common, as manure, 56 

 Sandy soil, 65 

 Saprophytes, 44 



Scion, influence of, on stock, 194 

 Sclerenchyma, 102 

 Scraping of stems, 105, 165 

 Scutellum of grasses, 249 

 Secondary thickening, 104 

 Seeds, formation of, 226 

 Seeds, manuring of, 251 

 Seeds, production of, 238 

 Seeds, treatment of, 244 

 Self-pollination, 239 



