Note 2 — Chapter V · CONCLUSION.

But though, where motives for keeping slaves fail, no external causes will give rise to slavery,—even when there are such motives, slavery will not exist, if there are no external causes rendering it possible, i.e. if there is no opportunity of procuring and retaining slaves. Where neither capture or purchase of aliens, nor enslavement of members of the tribe is practicable, or where the slaves can very easily escape, slaves cannot be kept, though there might be much use for them2.