138 FIXITY OF HABIT 



its habit of alighting here, while the secondary 

 habit of tilting the wings to heighten the mimicry 

 arose pari j^cissu with the mottling. 



If all this be true, a knowledge of the out-door 

 life of our friends, both as crawling worms and as 

 winged sylphs, may be of the utmost aid in attempts 

 to note the interrelationships of nature ; and these 

 as well as features of actual structure must be 

 accorded due weight in our classifications ; but 

 neither should be divorced from its fellow. 



