256 



INDEX 



Shoots, bending of, 155 



Shoots, treatment of, 134 



Shoots, twisting of, 157 



Sieve tubes, 12, 96 



Silica in plants, 35 



Slitting the bark, 164 



Sodium in plants, 35 



Soft bast, 13 



Soil, improvement of, 65 



Soil, permeability of, for air, 61 



Soil, power of absorption of, 40 



Soil, retentiveness of, 40 



Soil, structure of, 39 



Sphaero-crystals, 119 



Splint wood, 104 



Spongy parenchyma, 79, 119 



Stable manure, 56, 67 



Stamens, 215 



Starch sheath, 18 



Stem, function of, 105 



Sterility, 243 



Stigma, 215, 226 



Stomata, 78, 113 



Storage tissue, 18 



Stratification of seeds, 247 



Strontium in plants, 36 



Style, 226 



Sugar sheath, 18 



Sulphur in plants, 32 



Summer pruning, 137 



Superphosphates, 55 



Tannin, 124 

 Testa, 232 

 Thylloses, 28, 136 

 Tongue grafting, 189 

 Tracheids, 13, 26 

 Transpiration, 116 

 Trichomes, 116 

 Trimethylamin, 126 

 Trophoplasts, 130 

 Trophotropism, 93 

 Turgidity, 20, 28 

 Twisting of shoots, 157 



Vacuoles, 17, 127 

 Vascular bundles, 10 

 Vessels, 11 



Wateb-gland, 116 

 Water-stoma, 116 

 Watering, theory of, 205 

 Wild stock, influence of, 194 

 Wood cells, 1 1 

 Wood fibres, 95 

 Wood parenchyma, 12 

 Wounds, injiiries due to, 135 

 Wounds, healing of, 149 



Xanthophyll, 130 

 Xylem, 13 



Zinc in plants, 37 



THE END. 



Printed by Ballantyne, Hanson & Co. 

 Edinburgh and London 



