244 INSTINCT. Chap. VII. 



cuckoo ejecting its foster-brothers, — ants making slaves, 

 — the larvae of ichneumonidae 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. 



