A SWISS INTERLUDE i6 q 



the paler individuals, and consequently they are fertilized 

 and reproduce, whilst the race of the paler individuals 

 dies out from failure to attract the insects. Thus we 

 get a high-coloured race established in the mountains, 

 a race that can make haste and seize the brief opi 

 tunities of the short but brilliant summer. There arc 

 many peculiarities of form and colour of plants the life 

 conditions of which are diverse (e.g., woodland, moorland, 

 aquatic, seashore, dry air, moist air, etc.), which can be 

 shown by accurate observation to be specially related 

 to those life conditions. Those conditions allow the 

 peculiarities to survive and establish a race, in some 

 cases a species, whilst preventing the maturity or 

 destroying the life of those individuals not presenting 

 that advantageous peculiarity of variation. 



