WHAT EVOLUTION IS 109 



spring. In most instances it is a 

 quiet, unobtrusive natural phenome- 

 non that permeates nature in every 

 direction and is more truthfully rep- 

 resented by the quiet countryside than 

 by the turmoil of battle. 



Having reached some idea of what 

 is meant by natural selection or Dar- 

 winism and having seen how it may 

 be an active force in moulding plants 

 and animals, we may pause a moment 

 to compare it with what Lamarck be- 

 lieved to be the energizing factor in 

 evolution. Natural selection first of 

 all does not suffer from limitations 

 to the extent that Lamarckism does. 

 Natural selection not only applies to 

 all that Lamarckism reaches but it 

 meets with success such conditions as 

 the protective coloration of insects, 

 which, it will be remembered, were 

 hardly within the range of Lamarck's 

 principle. Insects, that have only an 



