Doubtless the antiquity of the human race is much greater than is usually assumed by those whose views of the past are still regulated by mediæval systems of chronology. Archæology and linguistic science, not to speak here of geology, make it certain that the period between the beginning of the human race and the birth of Christ would be more accurately stated if the centuries counted in the longest estimate of the rabbinical chronologies should be changed to millenniums. And they present also another fact, namely, that the antiquity of civilization is very great, and suggest that in remote ages it may have existed, with important developments, in regions of the earth now described as barbarous, and even, as Brasseur de Bourbourg supposes, on ancient continents or portions of continents now out of sight below the surface of the oceans. The representation of some speculators that the condition of the human race since its first appearance on earth has been a condition of universal and hopeless savagery down to a comparatively modern date, is an assumption merely, an unwarranted assumption used in support of an unproved and unprovable theory of man’s origin. Its use in the name of science by advocates of this theory, like the theory itself, shows that the constructive power of fancy and imagination will sometimes supersede every thing else, and substitute its ingenious constructions for legitimate conclusions, even in scientific speculation. We may claim reasonably that Brasseur de Bourbourg’s Atlantic theory is not proved, and on this ground refuse to accept it. So far as appears, it is a fanciful theory which can not be proved. No one is under obligation to attempt disproving it. It may, in some cases, win supporters by enlisting in its favor all the forces of imagination, to which it appeals with seductive plausibility. On the other hand, it will be rejected without much regard to what can be said in its favor, for it interferes with current unreasoning beliefs concerning antiquity and ancient history, and must encounter vehement contradiction from habits of thought fixed by these beliefs. True, some of the stock views of antiquity, by which it will be earnestly opposed, are themselves far more destitute of foundation in either fact or reason; but this will make no difference, as the habit of never allowing them to be subjected to the searching power of reason does not permit such persons either to believe or deny any thing connected with this topic in a reasonable manner.