INDEX 



A. 



Absorption, force of, in spongelets, 16. 



Acetate of lime, solution otj rejected by roots, 18. 



Air, deterioration of, by plants at night, SZT — introduction of heated, 

 to plant compartments, 1 53 — purification of, by plants, during 

 theday, 328 — of plant-houses, ventilation a means of drying, 153. 



Air passages penetrate plants in all directions, 102. 



Alburnum, 26 — its connexion with the spongelets, 12 — offices per- 

 formed by it, S2 — its importance, 33 — its quantity proportionate 

 to the number of buds, IST. 



Alburnous substance, 187. 



Ammonia employed to promote germination, 166. 



Amylaceous substance, 188. 



Annuals, oleraceous, 114. 



Annual rest of plants, 319. 



Anther, 56. 



Aquatic plants, 1 14 — necessity of maintaining a due degree of tem 

 perature in the water in which they are grown, 109. 



Aqueous matter, necessity of its excess being decomposed in fruits 

 during the p'"oeess of ripening, 115. 



Aqueous particles in plants, effects of their being frozen, 86. 



Arid regions, 321. 



Atmosphere, temperature of, at various places, 100 — unfavourable 

 state of, a cause of sterility in flowers, 171 — dry, produces an 

 inspissated state of the sap, 325. 



Atmospheric dryness, or moisture, extremes of, 132, 133 — aver^es 

 of, 133 — moisture, 125. 



Axil, 30. 



Axils of leaves, the situation where leaf-buds arc formed, SO. 



B. 



Balloon training, 262. 



Bark, 28 — its production, 26 — ^its distinct parts, in trees and shrubs, 

 27 — ^its anatomical relation to leaves, 37 — of the root, its office^ 



15* 



