92 HUNTING, PASTOKAL, AND AGRICULTUEAL ANTS. 



domesticated certain species of aphides, and may be 

 compared to the pastoral stage of human progress — to 

 the races which live on the produce of their flocks and 

 herds. Their communities are more numerous ; they 

 act much more in concert ; their battles are not mere 

 single combats, but they know how to act in combina- 

 tion. I am disposed to hazard the conjecture that 

 they will gradually exterminate the mere hunting 

 species, just as savages disappear before more advanced 

 races. Lastly, the agricultural nations may be com- 

 pared with the harvesting ants. 



Thus there seem to be three principal types, offer- 

 ing a curious analogy to the three great phases — the 

 hunting, pastoral, and agricultural stages — in the 

 history of human development. 



