INTRODUCTION 



they are composed of organs plants (and animals also) 

 are said to be organized, and are called organisms. For a 

 similar reason, the kingdom of living things is called the 

 organic kingdom, or the 6rganic world. 



Fig. 2. — Kohlrabi, showing the stem modified as an organ for the storage 

 of food, and a well developed tap-root. 



14. Root and Shoot. — Everyone knows that the plants 

 with which we are best acquainted have roots in the 



