INDEX SECOND. 



A. 



AERIAL, application of the term to leaves, 628. 

 u?Esculus Hippocastaminiy structure of its gems, 463. 

 Agave Americana, its foliar apertures, 611, 615. 

 Agostino Ma7idirola, extract from his treatise, 545. 

 Air, a component of soils, 218. 



vitiated by vegetating roots, 219. 



kind of, contained in hollow stems, 424 . 



Alburnurft, its character, 336. 



changes into hard wood, 337. 



" hardens when a tree is barked, 337. 



simple hardening of, does not constitute wood, 338, 



formation of the, 340. 



dies when exposed to the air, 354. 



is a reservoir of proper juice in winter, 355. 



^ loses its irritability on becoming- wood, 856. 

 Algae are propagated by the propago, 450. 

 Alienated leaves, their character, 528. 



Aloje, its leaf has few pneumatic apertures, 618. 



soccotrina, its proper juice affords a dye, 118. 



mode of its growth, 205. 



structure of its leaf, 562. 



verrucosa, form of its cuticular meshes, 605. 



Althaea officinalix t structure of its root, 439. 

 Annual herbaceous roots, structure of, 431. 



i zones of wood, origin of, 338. 



Annular vessels, their characters, 82. 



Anthoxanthum odoratum is odorous only when dried, 631. 



Apertures, foliar, 608. 



their varieties, 6o9. 



their size and number, 613. 



are the exhaling organs of leaves, 610, 619. 



are the respiratory organs, 62 1 . 



Aphis, its lateral propagation, 457. 

 Appendages, enumeration of, 628. 

 Aquatic plants, structure- of their foliar parenchyma, 596. 



. the leaves have no pneumatic slits, 608. 



Arctium lappa, structure of its root, 433. 



- has the largest leaf of any British plant, 546. 



Argillaceous earth, its effects in soils, 214. 



Ascidium of Cephalotus/oWicM/ara, 670. 



Nepenthes Distillaloria, 672. 



Atropa Btlladonna, structure of its root, 439. 

 2 



