The opportunity and the incentive to emulate increase greatly in scope and urgency.

The activity of the men more and more takes on the character of exploit; and an invidious comparison of one hunter or warrior with another grows continually easier and more habitual.

Tangible evidences of prowess--trophies--find a place in men's habits of thought as an essential feature of the paraphernalia of life.

Booty, trophies of the chase or of the raid, come to be prized as evidence of pre-eminent force.

Aggression becomes the accredited form of action, and booty serves as prima facie evidence of successful aggression.