864 INDEX. 



by dried roots, effects of, 294 — effects of immersing roots in 

 116. 



Watering, 113 — its effects on stiff soil, 122— has the effect of lower- 

 ing the temperature of the soil, 122 — newly planted trees, 294 

 — of roots, substitute for, under particular circumstances, 295. 



AVater plants, flowering of, 109. 



Weights applied to branches, 266 



Wet borders, 118. 



Whip-grafting, 216. 



Wind, its effect in increasing the dryness of the air, 129 — its effects 

 with regard to. fertilisation. 111 — ^its effect on the circulation of 

 sap, 16Y. 



Winds, table of, with the corresponding temperatures and dryness, 

 133, 134. 



Winter of plants, not in aU cases cold, 319. 



Wood formed by the combination of cellular tissue and woody fibre, 

 23 — of exogens, 24 — the channel for the ascent of all the fluids 

 of plants, 27 — of stems, 27 — central, its importance compared 

 with that of the alburnum and liber, 33 — central, example of 

 its removal, 38, 36. 



Woody matter, its first appearance, 24. 



Worms, injury occasioned by them to plants in pots, 120. 



Wounding of plants to be avoided when the sap first begins to flow, 

 244. 



W^ounds, processes by which they are healed, 26, 292. 



