82 



STRUCTURAL BOTANY. 



points. In the corm, the analogy is far more evident, for the xis is less excess! ve and 

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

 Uie scales often becoming excessive. 



270 



267, Oorm of Crocus, with new ones forming above. 268, Vertical section ( tb ame. 269, Sectioi 

 Df bulb of Hynointli, with terminal scape and axillary bulblet. 270, Section of Im.u of Oxalis violacea, 

 with axillary scapes. 



Review. %%). Give carefully the definition. Which forms are undeveloped? Which 

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

 cultivated? Usefulness of such stems. What is ward? 233. Define Root-stock? Show 

 KB 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. 2fiO how it "rows. 239. Define Corm. Show by fig. 263 how it grows. 240. De- 

 scribe the bulb. Show its growth by fig. 2G(J. 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, 

 the 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, 



