INSTINCT 219 



of our distinct Kitty-wrens, — a habit wholly unlike that 

 of any other known bird. Finally, it may not be a logical 

 deduction, but to my imagination it is far more satisfac- 

 tory to look at such instincts as the young cuckoo eject- 

 ing its foster-brothers, — ants making slaves, — the larvae 

 of ichneumonidae feeding within the live bodies of cater- 

 pillars, — not as specially endowed or created instincts, 

 but as small consequences of one general law, leading 

 to the advancement of all organic beings, namely, 

 multiply, vary, let the strongest live and the weakest 

 die. 



