192 



INDEX 



Nitrates, 123 

 Nitrogen, 76, 80, 81 

 Nodules, 137 



Oak, 47, 76, 81, 91 



Old man's beard, 70 



Onion, 10, 21, 23, 69 



Orange, 4 



Orchids, pollination of, 146 



Ovary, 140 



Ovules, 140, 142, 148 



Oxalis, 163 



Oxygen, 76 



Palms, germination, 10 ; structure 



of stem, 57 

 Pandanus, roots, 25 

 Pansy, stipules, 82 

 Parsley, 23 

 Parsnip, 23 



Pea, 4, 8, 13, 21, 23, 153 

 Peach, 151 

 Pear, stipules, 67 

 Pests of plants, 1 74 ; remedies for, 



177 



Petals, 140, 142 ; uses of, 144 

 Phosphate of lime, 130 

 Pilewort, 166 

 Pine, 74, H7, ^54, 160 

 Pistil, 142 ; uses of, 144 

 Pith, 48 



Plant food, 78, 93, 132 

 Plum, fruit, 151, 162 

 Plumule, 3, 6 

 Pollen, 140, 142, 144 

 Poppy, 150; fruit, 161 

 Potato, 55, 79, 8 3 

 Primrose, 53, 141, 154 

 Privet, 53 ; leaf-buds, 67, 81 

 Pupa, 170 

 Pyrethrum, I $6 



Radish, 4, 21, 69 



Radicle, 3, 6 



Raspberry, 151, 162 



Respiration of plants, 78 



Rhizomes, 44 



Rock rose, 165 



Root, 24 ; cap, 23, 30 ; hairs, 24, 

 30 ; systems, 30 



Roots, absorption by, 34 ; adventi- 

 tious, 27, 28, 38, 43, 54; and 

 gravitation, 35 ; and water, 37 ; 

 growth in length, 32 ; growth in 

 thickness, 31 ; of seedlings, 24 ; 

 uses of, 26 



Roses, 37, 56, 147, 154, 155, 172 ; 

 propagation of, 28, 39 



Salad, burnet, 165 



Salsify, 1 60 



Sand, 103 



Sap, 80 



Sapwood, 47 



Scale leaves, 44 



Scarlet runner, 8, 21, 56 



Scion, 49 



Screw-pine, roots, 25 ; root-caps, 30 



Sea-kale, 81 



Sea-purslane, 81, 86 



Sea-rocket, 81, 86 



Sedge, 161 



Seed beds, 16, 17 



Seed-coat, 3, 7 



Seed-leaves, 3, 8 



Seed, parts of, 2 



Seeds, I, 6, 140; albuminous, 5; dis- 

 persal of, 158 ; exalbuminous, 5 ; 

 germination of, 6, 13 ; testing 

 vitality of, 22 



Seedlings, raising, 15 ; variations 

 in, 153 



Sepals, 142 ; uses of, 144 



