WHAT MAKES MAN GO 



6i 



then it returns to the heart to travel through the 

 body again. The route in the body is relatively 

 very long and yet about 23 seconds is all of the 

 time required to traverse it entirely; while the 

 blood can flow from the heart into the lungs and 

 back again in less than 6 seconds. In the capil- 



m 



''■■I-} ^ h:\:-,l:'^-:. J^isade cells 





Spo?tcfij 



Tissued 



'.ZowcrEp 

 Sto7tiata 



Figure 16. Section of the leaf of a plant. In such cells as 

 these in the leaves of wheat, oats, corn, etc., are manufactured 

 not only the food of man and animals but of the plants them- 

 selves. After all of these centuries man must wait for the 

 season of harvest time when he gathers the product of these 

 living cells. 



laries, the flow of the blood is slightly slower than 

 elsewhere. It takes about one second for 

 the blood to flow a distance equal to the 

 thickness of an ordinary lead pencil, but even 

 so the cells must secure their necessary food 

 from a rapidly flowing blood stream as it 

 rushes by them. Unless it is conceded that certain 



