THE PLANT 



cam'bi urn, which is between the hard outer bark and the woody 



stem. It is diffused throughout the plant, and causes the cells 



which compose it to 



increase in size and 



in number, that is, 



it causes the plant to 



grow. 



Cells. If you ex- 

 amine the stem, leaves, 

 and roots of a cotton 

 plant under a micro- 

 scope, you find that 

 they are made up of 

 many parts of differ- 

 ent shapes and sizes. 

 These parts are called 

 cells. Old cells con- 

 tain water and air; in 

 young, active ones, 

 there are water and 

 a jellylike substance 

 called pro'to plasm. 

 This is a very wonder- 

 ful substance. The 

 wisest men cannot tell 

 you what life is, but 

 by long and patient 

 study they have 

 learned that the life of a plant or an animal exists in this substance 

 called protoplasm. 



Plants of a low order, such as the bacteria of which you will 



BUD AND BLOSSOM OF THE COTTON PLANT 



