56 



GARDENING BY MYSELF. 



and each part of a plant, you must remem- 

 ber, is made up of minute little cells, separ- 

 ated by only a wall of thin tissue. As the 

 plant grows, the cells expand to their full 

 size, and then divide themselves in two by 

 throwing across from side to side a new lit- 

 tle wall of tissue. In its turn each half of 

 the divided cell stretches out to full pro- 

 portions and divides again ; and so the pro- 

 cess goes on. Now these cells are not emp- 



SECTION OP MAPLE ROOT TO SHOW THE CELLS. 



ty, but are full of a thin sort of mucilage, 

 with often a little nucleus of matter still 

 more solid. If then, the cold is intense 



