THEIR SIZE 9 



Here, then, we have two spheres, the one A of 

 an inch in diameter, and the other a50 8 OOTr of an 

 inch in diameter. How many times is the latter 

 sphere contained in the former? 



Spheres are to each other as the cubes of their 

 diameters. The cube of A is T^TF- The cube of 



^5 000 IS T5T5T5 000000000 OT77F- 



And the former cube divided by the latter is 

 more than 3,700,000,000. That is to say, more 

 than thirty-seven hundred millions of these in- 

 finitely small beings might be packed within the 

 capacity of the tiny drop. 



Yet, as we shall see, these beings have all the 

 functions of common life. 



