s 
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 organic 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 
