WHAT pejopte; are; made; of 41 
and all these different shaped and differently acting cells 
are connected one with another so that they may work 
together to make up your living body. 
Look at the picture. It is the presence of thousands 
of cells like Number 1 which enables you to smell. Num¬ 
ber 2 is the tiny cell from which a mouse finally grows, 
and Number 3 is the cell from which a bird finally grows. 
Here is the way Mr. Julian Huxley describes the team¬ 
work of the cells—I have changed a few of his words: 
“A human body is a huge cell-state, with a cell-popula¬ 
tion thousands of times larger than the total human 
population of the world. A single act of thought means 
the teamwork of a vast multitude of brain-cells, a single 
movement of a limb sets to work thousands of muscle- 
cells, a single beat of the heart sends billions of blood- 
cells whirling down the dark pipes we call blood-vessels. 
Each of these cells is a unit of life, to be compared to a 
single free-living cell, such as the ameba.” 
When we speak of living tissue, we mean a great mass 
of these connected cells; a strip of flesh is tissue, the 
cambium of your oak tree is tissue. 
What does the robin do when the time comes for her 
to multiply, when the time comes for her to make four 
of herself, instead of one? She lays eggs, and the 
shells burst, and out of each pretty blue shell comes a 
baby robin which very soon grows into a mother robin or 
