850 INDEX. 



Fruit, its maturation, 69 — its ripening affected by pruning, 246 — its 

 physiological action analogous to that of a leaf, 71 — its physio- 

 logical use, 71 — derivation of its food, 70 — is an advanced stage 

 of a flower, 69 — differs from leaves in its appropriation of the 

 sap which it receives, 73 — attracts food from the surrounding 

 parts, 70 — its secretions, 74 — changes which it undergoes, 74 — 

 aqueous matter in, requires decomposition, 116 — succulent, 

 ripening of, 116 — effects produced on, by ringing, 254 — method 

 of obtaining improved varieties of, 311 — superior and inferior, 

 table of, 71 — on what its size and excellence depend, 72 — cause 

 of the weaker portion of it being generally thrown off, 72 — the 

 secretions of, partly changed by heat, 74 — influenced by light, 

 74 — the decomposition or dissipation of water by, 76 — the ripen- 

 ing of, retarded by an excessive supply of water, 76. 



Functions of leaves, termination of their performance, 57. 



Fungi, deleterious parasitic, 149, 155. 



Garden, choice of soil for a, 137 — situation for a, 187 



Gases, their destructive effects on vegetation, 152. 



Geothermometrical averages, 94. 



Germination, 7 — conditions required to produce it in seeds, 8 — why 

 best effected in the absence of light, 9 — requires communication 

 with the atmosphere, 8 — requires different degrees of heat in 

 different species, 9 — causes of, 78— degree of heat required for 

 seeds of tropical trees, 103 — is assisted by the absorption of 

 water, 8 — interrupted, 1 60. 



Germination, means of promoting it, 163 — means of assisting it in 

 cases of seed with very hard integuments, 164. 



Glass, the coldness of its surface condenses the enclosed atmospheric 

 vapour, 144. 



Glass roofs, their coldness a cause of dryness in the state of the in- 

 ternal air, 148. 



Glazed houses, means of applying temperature and moisture to the 

 atmosphere of, 142. 



Grafting, propagation by, 216 — modes of operation, 216, 219 — de- 

 grees of affinity within which the operation may be performed, 

 222 — deceptions practised with regard to it, 22S — on roots, 224 

 — herbaceous plants, 236 — -pines, 287. 



