



CHAPTER II. 



RESERVE MATERIALS SEEDS OF THE BEAN AND THE 

 GOURD OR PUMPKIN TUBERS OF THE JERUSALEM 

 ARTICHOKE AND OF THE POTATO BULB OF THE 

 TULIP. 



IN the last chapter it was explained how a plant, 

 Yeast or Spirogyra, increases in size by manufacturing new 

 cell- walls and new protoplasm from the food material 

 supplied to it in certain nutrient fluids. 



The present chapter is meant to illustrate the im- 

 portant fact that a plant may grow in one part, that is to 

 say that new cells may come into existence and these 

 cells may increase in size, by the rearrangement of food 

 material stored up in another part of the plant. This 

 principle is illustrated in the germinating seeds of the 

 bean and gourd, in the sprouting tubers of the potato 

 and Jerusalem artichoke, and in the bulb of the tulip. 



The study of the form of these specimens will also 

 serve as an introduction to some of the simpler parts of 

 the morphology of plants. 



A seed, e.g. that of the bean, consists of a young plant or 



