92 HUNTING, PASTOEAL, AND AGBICULTUKAL 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. 



