I THE ORIGIN OF MAN 



And God said, Let there be light: and there 

 was light. And God saw the light, that it was 

 good: and God divided the light from the dark- 

 ness. And God called the light Day, and the 

 darkness he called Night. And the evening and 

 the morning were the first day. 



Before we proceed we will devote a few mo- 

 ments of our time to the theories of light, as 

 light is essential to man, and to be better able to 

 understand the evolution of man, it will be neces- 

 sary to know what light really is. The source of 

 most of our light is, as we all know, the sun. Sir 

 Isaac Newton believed that light is due to the 

 emission of luminous particles from the source. 

 This hypothesis is known as the emission theory 

 and he appears to have adopted this hypothesis 

 chiefly because it explained the rectilinear propa- 

 gation of light. However, the wave theory which 

 is the more acceptable, supposes that space is 

 filled with a rare medium, the ether, through 



