Chap. VIII.] SUMMARY. 365 



bird. Finally, it may not be a logical deduction, but 

 to my imagination it is far more satisfactory to look at 

 such instincts as the young cuckoo ejecting its foster- 

 brothers, — ants making slaves, — the larvae of ichneu- 

 monidse feeding within the live bodies of caterpillars, — 

 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. 



(78) 



END OF VOLUME L 



