Note 4 — INTRODUCTION.

"It is impossible to deny the advancement of civilization in that zone of the African continent which has formed the field of our inquiry. Yet barbarism is there supported by natural circumstances with which it is vain to think of coping. It may be doubted whether, if mankind had inhabited the earth only in populous and adjoining communities, slavery would have ever existed. The Desert, if it be not absolutely the root of the evil, has, at least, been from the earliest times the great nursery of slave hunters. The demoralization of the towns on the Southern borders of The Desert has been pointed out; and if the vast extent be considered of the region in which man has no riches but slaves, no enjoyment but slaves, no article of trade but slaves, and where the hearts of wandering thousands are closed against pity by the galling misery of life, it will be difficult to resist the conviction that the solid buttress on which slavery rests in Africa, is—The Desert." (p. 139.)