346 



INDEX. 



Vascular layer of, its situation and character . 



it vessels, supposed to convey down- 

 wards the proper juice ..... 



inner, or Liber, sometimes constituting a network, 



like gauze 



the principal source of vegetable vitality 



forms the part by which grafts unite ; and elaborates 



the alburnous matter .... . 

 Beech-drops (Epiphegus, or Orobanche), the genus of 



Befaria, the genus 



Bellwort (Uvularia), the genus of 



Birthwort (Aristolochia), the genus of 



Biscutella, how distinguished 



Bladder Senna (Colutea), its generic trait 



Bloodroot (Sauguinaria), the genus 



Blue-curls (Trichostema), the genus of 



Bluebottle, Sic. (Centaurea), the genus of 



Blue-eyed Grass (Sysirinchium), the genus 



Boletus, the generic character 



Bow-wood, Osage-apple (Maclura), the genus 



Brake (Tteris), the genus of . 



Bramble (Rubus), the generic character . 



Branches, their origin and attachment, . 



similar in structure with the trunk 



their buds, when first visible . 



how connected with the trunk 



273- 



their successive developement from the bud 



— their origin and connexion explained by the dia- 



gram [Plate 11, fig. 5]. 

 — summary conclusions concerning their origin 



Buds, how and where formed 



transferred by irigraftment 



traceable, by a white line, to their sole origin in the 



medullary sheath of the first year's growth of the al- 

 burnum 



2 or more present near the same point of attachment 



their limited protrusion, practically known to horti- 

 culturists, and the use resulting from this theory 



latent, or inert, often carried forward many years pre- 

 vious to their developement on the surface of the stem ; 

 their duration then more than annual, like the inactive 

 embryon within the seed : when destroyed, buried be- 

 neath the wood 



generated in vital points in the first period of the 



growth of the stem and branch, and axillary 



distinct vegetable beings, and similar to the parent 



their individuality, though connected with the com- 

 mon trunk or branch ...... 



by what means evolved, and how nourished . 



259 



ib. 



260 

 261 



ib. 

 134 



95 



85 

 185 

 137 

 158 

 117 

 129 

 175 



58 

 216 

 191 

 211 



26 

 273 

 275 

 273 

 274 

 ib. 



281 



231 



275 



5 



276 



277 



277 



278 



278 

 221 



278 



279 



