INDEX. 353 



— the lines forming the meshes believed to be lym- 

 phatic vessels 306 



— the meshes of the cuticular layer differ in size, but 

 always minute ib. 



— cuticular cells, their form ; in one or more layers ib. 



— their slits or apertures various, and where situated 307 

 — they occupy the upper disk only of floating 



leaves ib. 



— surrounded by borders ... ib. 



— different forms and varieties of [v. Plate 11.] 308 

 scarcely ever seen on the upper surface 

 of the leaves of ligneous plants, but on both surfaces 



in herbaceous ones ib. 



their appearance in the vertical section of 



a leaf 309 



connected with the ultimate ramifications 



of the vessels of the leaf ib. 



believed to be the exhalent and respiratory 



organs of plants 310 



facts in support of their respiratory function 311 



opinions on their origin . . . 313 



Leaves, their importance in the vegetable economy recap- 

 itulated 313 



Legume, what kind of fruit 12 



Lespedeza, how distinguished from Hedysarum . . 156 

 Lettuce (Lactuca), how distinguished .... 163 

 Liatris, the genus of, and some of the species . . . 166 

 Liliaceous Flower, and general remarks ... 1 



Lily (Lilium), the genus 84 



Ligneous fibre, its character and uses — conjectures con- 

 cerning its origin 236 



how obtained pure for examination — physical pro- 

 perties, and relation to chemical agents — becomes 

 charcoal on burning ...... ib. 



Lima-bean (Dolichos), how known 

 Liverwort noble (Hepatica), the genus . 

 Lizard's-tail (Saururus). the genus 

 Locust-tree (Robinia), generic character 

 Lucern, &c (Medicago), how known . 

 Lungwort (Pulmonaria), the genus of 

 Lupin (Lupinus), the genus and some species 

 Lygodium, the genus of ... . 

 Lysimachia ('Loosestrife), the genus of 

 Lythrum, allied to Lagerstrremia 



157 

 . 122 

 92,93 

 . 158 



ib. 



66 



152, 153 



. 212 



68 

 . 112 



M. 



Magnolia, how distinguished from Lyriodendron . 120 



some account of the principal species . . 121 



Maidenhair (Adiantum), the generic trait . . . 211 



