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Rh can be lost. Moreover, in striking a balance between the effects of forward and backward movement in civilization, it must be borne in mind how powerfully the diffusion of culture acts in preserving the results of progress from the attacks of degeneration. A progressive movement in culture spreads, and becomes independent of the fate of its originators. What is produced in some limited district is diffused over a wider and wider area, where the process of effectual 'stamping out' becomes more and more difficult. Thus it is even possible for the habits and inventions of races long extinct to remain as the common property of surviving nations; and the destructive actions which make such havoc with the civilizations of particular districts fail to destroy the civilization of the world.

The enquiry as to the relation of savagery to barbarism and semi-civilization lies almost entirely in præ-historic or extra-historic regions. This is of course an unfavourable condition, and must be frankly accepted. Direct history hardly tells anything of the changes of savage culture, except where in contact with and under the dominant influence of foreign civilization, a state of things which is little to our present purpose. Periodical examinations of low races otherwise left isolated to work out their own destinies, would be interesting evidence to the student of civilization if they could be made; but unfortunately they cannot. The lower races, wanting documentary memorials, loose in preserving tradition, and ever ready to clothe myth in its shape, can seldom be trusted in their stories of long-past ages. History is oral or written record which can be satisfactorily traced into contact with the events it describes; and perhaps no account of the course of culture in its lower stages can satisfy this stringent criterion. Traditions may be urged in support either of the progression-theory or of the degradation-theory. These traditions may be partly true, and must be partly untrue; but whatever truth or untruth they may contain, there is such difficulty in separating man's recollection of what was from his