ANALYSIS OF THE LESSONS. VU 



LESSON VIII. MoRiMioi.ooY of Lkaves as Foliage. ... p. 54. 



1.30. FoIin.iTC tlic natural state of Icavi'tJ. l.Tl. Lr-avos a rnntrivanre for in- 

 crea-sinj,' .snifacc : tlio vast .'^urf.u-c of a tree in leaf. l."5i', 1.'53. The parts of a 

 leaf. 134. The hiaile. 13"). Its ])nlp or soft ])art and its franic\v<»rk. 136. 

 Tlic latter is wood, and forms the ril)s or veins and veinlcts. 137. Division and 

 use of tiicsc. 138. Venation, or mode of veining. 139. Its two kinds. 140. 

 Ncttcd-veined or reticulated. 141. rarallel-veined or nerved. 142. The so- 

 called veins and nerves essentially the same thing; the latter not like the 

 nerves of animals. 143. IIow the sort of veining of leaves answers to the nnm- 

 her of cotyledons and the kind of plant. 144. Two kinds of parallel-vcincd leaves. 

 145, 146. Two kinds of netted-veined leaves. 147. Relation of tlic veining to 

 the shape of the leaf. 148 - l.'il. "Forms of leaves illustrated, as to general out- 

 line. I'y2. As to the base. 153. As to the apex. 



LESSON IX. Morphology of LE.\.rES as Foliage ; continued, p. 61. 



154, 155. Leaves either simple or compound. 156-162. Simple leaves il- 

 lustrated as to particular outline, or kind and degree of division. 163. Com- 

 pound leaves. 164. Leaflets. 165. Kinds of compound leaves. 166, 167. 

 The pinnate, and, 168. the palmate or digitate. 169. As to number of leaflets, 

 &c. 170. Leaflets, as to lobing, &c. 171, 172. Doubly or trebly compound 

 leaves of both sorts. 173. Peculiar forms of leaves explained, such as: 174. 

 Perfoliate: 175. Equitant : 176. Those without blade. 177. Phyllodia, or 

 flattened petioles. 178. Stipules. 179. Sheaths of Grasses ; Ligulc. 



LESSON X. The Arrangement of Leaves. 



181. Phyllotaxy, or arrangement of leaves on the stem : general sorts of ar- 

 rangement. 182. Leaves arise only one from the same place. 183. Clustered 

 or fascicled leaves explained. 184. Spiral arrangement of alternate leaves. 185. 

 The two-ranked arrangement. 186. The three-ranked aiTangcmcnt. 187. The 

 five-ranked arrangement. 188. The fractions by which these are expressed. 

 189. The eight-ranked and the thirtccn-ranked arrangements. 190. The series 

 of these fractions, and their relations. 191. Opposite and whorled leaves. 

 192. Symmetry of leaves, &c. fixed by mathematical rule. 19.3. Vernation, or 

 an-angcment of leaves in the bud. 194. The principal modes. 



LESSON XI. The Arrangement of Flowers on the Stem, 



OR Inflorescence p. 76. 



195. Passage from the Organs of Vegetation to those of Fructification or Re- 

 production. 196. Inflorescence: the arrangement of flowers depends on that 

 of the leaves. 197. They arc from cither terminal or axillary buds. 198. In- 

 determinate InHoreseencc. 199. Its sorts of flower-clusters. 200. Flower- 

 stalks, viz. podiniclcs and pedicels, bracts and b.actlcts, &c. 201. Raceme. 

 202. Its gradation into (203) a Corymb, ami that (204) into (205) an Umbel. 

 206. Centripetal order of development 207. The Spike. 208. The Head. 



