606 



INDEX. 



Water enters into the composition of the 



food of plants, 28 

 evil effeota of, to seeds when 



given in excess, 233 

 excess of, in the soil, injures 



plants, 137 

 injvirious effects of, to cuttings, 



prevented by collodion, 294 



in a tepid state applied to roots, 14 9 



instance of the extension of roots 



in search of, 19 



in which aquatics are grown, 



necessity of regulating to a due 



degree of temperature, 150 

 is decomposed by the vital 



action of plants, 60 



its decomposition or dissipation 



by fruit, 102 



its effects on maturation, 102 



its importance in supplying the 



food required by cuttings, 292 



pure, cannot solely support vege- 



tation for a long period, 28 



rain,or river, bBstforcuttings,299 



relation of, to succulence, 167 



replaces the sap on which leaves 



usually subsist until they emit 

 roots, 277 



roots growing in, 21 



should be diminished when fruit 



is ripening, 167 



the natural food of plants, 651 



. the temperature for watering, a 



matter of great moment, 176 

 Watering, 159 



a preventative of mildew in 



annuals, 176 

 , effects of natural and artificial, 



171 



effects of, on stiff soils, 172 



frozen plants, good effects of, 



112 



lowers the temperature of the 



sou, 172 

 newly planted trees, 462 



the evils of, 176 



time of day for, 173 



Water-plants, flowering of, 150 



Wax for grafting, composition of, 339, 

 331, 340 



Wearing out of plants, theory of, er- 

 roneous, 478 



Wet borders, 170 



Wheat segilopian, origin of, 483 



Whip-grafting, 314 



Wind causes cold, 187 



its effect in increasing the dryness 



oftheair, 186 



Wind, its effect on the circulation of the 



sap, 215 

 with regard to fertilisa- 



tion, 241 



statement of, with degi-ees of dry- 



ness, 188 

 Winter ventilation, 223 



wet, effects of, 160 



Wood, 42 



ashes as a manure, 556 



charred blocks of, valuable for 



orchidaceous plants, 646 



central, example of its removal, 48 



central, of little consequence in 



comparison with that of the 

 alburnum and liber, 45 



formation of, 34, 70 



Wood, formation of, in a root without the 

 existence of a stem, 261 



formation of, wholly local and 



superficial, 343 



formation of, without the aid of 



leaves, 38 



inscriptions buried in, 39 



of exogens, 35 



of stems, 40 



reason why more is formed on the 



south side of a tree than on the 

 north, 71 

 ■ — — removal of, in budding, does not 

 injure the eye, 306 



renovation of, 36 



the channel for the ascent of all the 



fluids of plants, 40 



theory of growing downward from 



leaves erroneous, 71 

 Woody fibre, originates in the leaves, 34 

 Woody matter, is abundant or absent 

 in proportion to the 

 strength or absence of 

 the leaves, 34 

 its first appearance, 34 



Worms, injury occasioned by, to plants 



in pots, 171 

 Wounds, of roots, should be cut to a 

 clean smooth face, 460 



of stem, repaired by cellular or 



horizontal system, 35 

 Burface,instances of, and power 



of reparation, 37 



Yeast, putrid, its powerful effects as a 

 manure, 561 



Zantedbschi, M., his experiments on the 

 influence of moonlight on plants, 63 



ERADBUBV AND EVANS, PRINTERS, WHITBFRIARS. 



