INDEX. 849 



Erergreen plants, 53. 



Evergreens, season for transplanting, 284 — epidermis of their leaye^ 

 285. 



Excitability diminished by lowness of temperature, Si. 



Excrementitiousmatterof plants poisonous, 20, 21 — matter of plants 

 superfluous, 20. 



Excretory functions of roots, 2'70. 



Exogens, 24, 29 — their pith central and distinct^ 21. 



Exposure of green-house plants, 278, 



Eyes, propagation by, 184. 



F. 



Fall of the leaf, 54. 



Fertilisation, 68— of the Mistletoe, 314. 



Fibrous roots, production of, by root-pruning, 292. 



Fibre, woody, originates in the leaves, 24. 



Field crops, germination of, in wet seasons, 116. 



Fig-trees, mode of pruning, 242. 



Filament, 66. 



Floral envelopes, 56. 



Flowers, their action, 55 — their structure, 66 — essentially constituted 

 only by the presence of the sexes, 56 — double, 57 — their parts 

 are modified leaves, 62 — their metamorphoses, 57 — their pro- 

 duction induced by ringing, 263 — tendency in some to become 

 double, 316 — causes of their not expanding, 84. 



Flower-buds, their production depends upon the presence of nutritious 

 matter, 64. 



Flues, 143. 



Fluids, ascending, their channel in plants, 27 — their mode of descent, 

 27 — ^their lateral transmission, 33 — are attracted into the sys- 

 tem of plants, during the night, 49. 



Flute-budding, 216. 



Food, natural, of plants, 18. 



Frost, its effects on plants, 84 — its physiological effects on vegetables 

 accounted for, 140 — its accumulation in valleys, 138. 



Fructification, period of its commencement in plants, 63 — ^may be 

 advanced or retarded artificially, 64 — means of advancing its-" 

 period, 64— influenced by ringing, 66 — its removal in a young 

 state strengthens the functions of the leaves, 79 — induced by 

 an inspissated state of the sap, 825. 



