ROOTS. 



27 



In the Indian corn, roots are sent out from nodes at some 

 distance above the ground and finally descend until they 



Fig. 13. — Aerial Boots of an Orchid. 



enter the ground. They serve the double purpose of anchor- 

 ing the corn-stalk so as to enable it to resist the wind and of 

 supplying additional water to the plant.'' 



1 Specimens of the lower part of the corn-stalk, with ordinary roots and aerial 

 roots, should he dried and kept for class study. 



