348 INDEX. 



D. 



Damping ofif, 149. 



Deciduous plants, 73 — trees, season for transplanting, 282. 



Degeneracy, means of preventing it in seed crops, 302. 



Degeneration of varieties, 302. 



Deleterious matter thrown off by roots, 20 — substances, when 

 attenuated, are most likely to prove injm'ious to plants, 18. 



Dew-point, 126. 



Digestion, a function of the leaves, 40. 



Diurnal rest of plants, 827. 



Drainage, 118 — of pots for plants, 119, 275 — of soil in pots by frag- 

 ments of absorbent stone, 275. 



Dryness, atmospheric, table of, with regard to the direction of the 

 wind, 133, 134 — causes of, in hothouses, 143. 



Double composite flowers, 316. 



Double Dahlias not truly double flowers, 315. 



Double flowers, 815 — conditions under which they may and may not 

 produce seed, 173. 



Double pots employed for striking cuttings, 202 — ^for plants, 274. 



Double Stocks, 318. 



Dung-heat, Grapes and Nectarines forced by it, 146. 



Dwarfing trees, Chinese mode of, 251. 



E 

 Earth, temperature of; at various places, 91, 92. 

 Earths, certain of them enter into the composition of the food of 



plants, 17. 

 Easterly winds, their dryness, 180. 

 Embryo buds, 30. 



Endogens, 24, 29 — mixed arrangement of their tissue, 29. 

 Envelopes, not a necessary part of a flower, 55. 

 Epidermis, in its young state, highly sensible to the stimulus ot 



light, 115 — regulates the amount of perspiration, 53 — of leaves, 



88 — an extension of the outer bark of the stem, 40 — o;' the 



leaves of evergreens, 285 — of plants inhabiting shaded situations, 



44. 

 Evaporation, an important vital function of plants, 125 — affected by 



elevation, 129 — affected by wind, 129 — from the surface of 



■oions, 236. 



