46 life's beginning on the earth 



In demonstrating this fundamental relation, science has 

 made the first step in our day towards the realization of an 

 old dream of mankind: to determine how the complicated 

 forms of living organisms are built up from invisibly small 

 atoms, linked together according to a definite order, so that 

 finally, from trillions and quadrillions of them, visible 

 structures arise — plants or animals. 



The second act which is about to begin presents the prob- 

 lem of life from an entirely different angle. 



