82 



STRUCTURAL BOTANY. 



points. In the conn, the analogy is far more evident, for the xxis is less excessive and 

 the scales more manifest; and lastly, in the bulb the analogy is complete, or overdone, 

 the scales often becoming excessive. 



270 



267. Corm of Crocus, with new ones forming above. 268, Vertical section of th<- ,ame. 269, Section 

 Df bulb of Hyacinth, with terminal scape and axillary bulblet. 270, Section of buiD of Oxalis violacea, 

 w ith axillary scapes. 



Review. 230. Give carefnlly the definition. Which forms are undeveloped? Which 

 partly developed ? 231. Define the Creeper. Its two classes. How is Witch grass best 

 cultivated? Usefulness of such stems. What, is sward f 233. Define Koot-stock ? Show 

 its manner of growth by the figure (258). 235. What is the premorse Root-stock? 236. 

 The stem of Clover, Asparagus, etc., in Winter is what? 237. What is a Tuber? Show 

 by fig. 200 how it grows. 239. Define Corm. Show by fig. 203 how it grows. 240. De- 

 scribe the bulb. Show its growth by fig. 266. Varieties. 243. Point out the gradation 

 in tuber, conn, and bulb. 



CHAPTER XVIII. 



THE LEAF-BUD. 



244. It is but a step from the study of the bulb to that of the 

 leaf-bud. Buds are of two kinds in respect to their contents 

 the leaf-bud containing the rudiments of a leafy stem or branch, 

 t-he flower-bud containing the same elements transformed into the 

 nascent organs of a flower for the purpose of reproduction. 



245. The leaf-bud consists of a brief, cone-shaped axis with 

 a tender growing point, bearing a protecting covering of imbri- 

 cated scales and incipient leaves. 



246. The leafy nature of the scales is evident from a careful 

 inspection of such buds as those of the Rose, Currant, Tulip-tree, 



