140 
sided, and laid against one another in an orderly and 
beautiful fashion, while the outer ones are mostly round. 
All animals, we ourselves, all plants, began life as a 
single cell. 
Sometimes a cell will spend its life alone. When the 
time comes for it to add to. the life of the world; it 
divides into two or more ‘daughter cells,” as they are 
called. These break away from one 
another, and in like manner divide 
again. 
But usually the single cell which 
marks the beginning of a new life 
adds to itself other cells; that is, the 
different cells do not break away 
from one another, but all cling to- 
gether, and so build up the perfect 
plant or animal. 
By just such additions the great- 
est tree in the forest grew from a 
FIG. 136 
single tiny cell. 
By just such additions you children have grown to 
be what you are, and in the same way you will con- 
tinue to grow. 
Every living thing must eat and breathe, and so all 
living cells must have food and air. These they take 
in through their delicate cell walls. The power to do 
this comes from the bit of living substance which lies 
within these walls. 
This strange, wonderful material within the little cell 
is what is alive in every man and woman, in every boy 
and girl, in every living thing, whether plant or animal. 
