850 INDEX. 



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

 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, 67. 



Fungi, deleterious parasitic, 149, 168. 



G. 



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



Gases, their destructive effects on vegetation, 162. 



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 fot 

 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 

 eases 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 maybe performed, 

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

 — herbaceous plants, 236 — pines, 287. 



