16 



THE STEM 



scales, and the buds beneath them may I 

 scarcely visible. Thus the "eyes" on an Iris 

 potato are cavities with a bud or buds at tl 

 bottom. (Fig. 24.) Sweet potatoes have r 

 evident "eyes" when first dug (but they ma 

 develop buds before the next growing season 

 The Irish potato is a stem; the sweet potai 

 is an enlarged root. 



46. How Stems Elongate. Roots elonga 

 by growing near the tip. Stems elongate t 



22. wintergreen, growing more or less throughout the young 



QJ . between j om t s . But any pa 



23. Rhizome of a wild sunflower. 



showing rootstock. soft 



of the stem soon 



reaches a limit be- 



yond which it cannot 



grow, or becomes 



"fixed;" and the new 



parts beyond elongate 



until they, too, become 



rigid. When a part of the stem once becomes fixed or har 



it never increases in lengt 

 that is, the trunk or wooc 

 parts never grow longer < 

 higher; branches do not b 

 come farther apart or high 

 from the ground. 



47. The different regions 

 growth in stems and roo 

 may be observed in seedlii 

 plants. Place seeds of radii 

 or cabbage between layers 

 blotting-paper or thick clot 

 Keep them damp and wan 

 When the stem and root ha^ 



24. Potato. Stems (where?) .fine , i i i / i 



roots, and rootstocks. grown an inch and a half loi 



