MORPHOLOGY OF THE SEEDLING 



27 



little or nothing in the color, shape, or general appearance 

 of the cotyledon to make one think it really a leaf, and it 

 is only by studying many cases that the botanist is enabled 

 to class all cotyledons as leaves in their nature, even if they 

 are quite unable to do the ordinary work of leaves. The 



■I 



Fig. 10. 



Fig. 11. 



Fio. 10. A Turnip Seedling, with tlie Cotyledon.s developed into 

 Temporary Leaves. 



ft, root>-hairs from tlie primary root ; 6, bare portion of the root on 

 which no hairs have as yet been produced. 



Fig. 11. Cross-Section of a Root. 



A good deal raagniiied, showing root-hairs attached to particles of 

 soil, and sometimes enwrapping these particles. 



study of the various forms which the parts or organs of a 

 plant may assume is called morphology; it traces the rela- 

 tionship of parts which are really akin to each other, 

 though dissimilar in appearance and often in function. 

 In seeds which have endosperm, or other food outside 

 of the embryo, the cotyledons usually become green and 



