Perched on an eminence, and based on solid rock, it may escape entombment, but more swiftly and more certainly will it be destroyed by the elements,[94] and by the decomposition of its own material furnish the shroud for its envelopment.[95] It is not altogether surprising then that no older discoveries than those already quoted have yet been made, for these would probably never have resulted if tradition had not both stimulated and guided the fortunate explorer. It is, therefore, no unfair inference that the remains of equally important, but very much more ancient cities and memorials of civilization may have hitherto entirely escaped our observation, presuming that we can show some reasonable grounds for belief that, subsequent to their completion, a catastrophe has occurred of sufficiently universal a character to have obliterated entirely the annals of the past, and to have left in the possession of its few survivors but meagre and fragmentary recollections of all that had preceded them. Now this is precisely what the history and traditions of all nations affirm to have occurred. However, as a variance of opinion exists as to the credence which should be attached to these traditions, I shall, before expressing my own views upon the subject, briefly epitomize those entertained by two authors of sufficient eminence to warrant their being selected as representatives of two widely opposite schools. These gentlemen, to whom we are indebted for exhaustive papers,[96] embracing the pith of all the information extant upon the subject, have tapped the same sources of information, consulted the same authorities, ranged their information in almost identical order, argued from the same data, and arrived at diametrically opposite conclusions. Mr. Cheyne, following the lead of Continental mythologists, deduces that the Deluge stories were on the whole propagated from several independent centres, and adopts the theory of Schirrer and Gerland that they are ether myths, without any historical foundation, which have been transferred from the sky to the earth. M. Lenormant, upon the other hand, eliminating from the inquiry the great inundation of China in the reign of Yao, and some others, as purely local events, concludes as the result of his researches that the story of the Deluge "is a universal tradition among all branches of the human race," with the one exception of the black. He further argues: "Now a recollection thus precise and concordant cannot be a myth voluntarily invented. No religious or cosmogenic myth presents this character of universality. It must arise from the reminiscences of a real and terrible event, so powerfully impressing the imagination of the first ancestors of our race, as never to have been forgotten by their descendants. This cataclysm must have occurred near the first cradle of mankind and before the dispersion of families from which the different races of men were to spring."