The Science of Plant Growing 



35 



New roots of this kind are formed each year, until the bulb has reached 

 its normal depth." [j. F.] 



5. THE STEM AND ITS FUNCTIONS 



The Seedling" Stem. Almost any seedling will serve to show the 

 origin and development of the stem from an early stage of its growth. 



Fig. 19. 1, 2, Seedling of Nasturtium (Tropceolwn majus). 3, 4, Seedling of Water Chestnut (Trapa 

 jiatam) with section of seed. 6, 6, Seedling of Austrian Oak (Quercus austriaca). 7, 8, 9, 10, Stages in 

 the germination and growth of Date Palm (Phoenix dactylifera) with sections. 11, 12, 13, Seed and 

 germination of same of Reed Mace (Typha Shuttlewwthi). 14, 15, Seedling of Sedge (Carex mtlgaris). 

 1-8 nat. size ; 9, 10, x 8 ; 11-13, x 4 ; 14, 15, x 6. 



It forms part of the embryo, while still in the seed. A Stock, China Aster, 

 Cabbage, or Gourd seedling (fig. 18) will serve the purpose. Between the 

 ground and the seed leaves the short, upright portion is the first visible 

 part of the stern, to which various names have been given, including 



