no WHAT EVOLUTION IS 



imperfect resemblance to the bark of 

 the tree on which they rest, are much 

 more Hkely to be espied and carried 

 off as prey, than those that have a 

 closer resemblance. Natural selec- 

 tion may in this case be expected 

 to act with full efficiency whereas 

 Lamarck's principle, as already indi- 

 cated, is apparently entirely inappli- 

 cable. From this standpoint, natural 

 selection is not subject to the limita- 

 tions that characterize Lamarck's 

 hypothesis. 



Further, natural selection is not 

 concerned with the inheritance of ac- 

 quired characters. The slight indi- 

 vidual differences, upon which it is 

 believed to act, are not differences 

 due to the action of the environment 

 on the given organism but are inborn 

 traits which in consequence may be 

 handed on through the germ cells to 

 descendent offspring. In these two 



