The legends seem to represent the diverging memories which separating races carried down to posterity of the same awful and impressive events: they remembered them in fragments and sections, and described them as the four blind men in the Hindoo story described the elephant;--to one it was a tail, to another a trunk, to another a leg, to another a body;--it needs to put all their stories together to make a consistent whole. We can not understand {p. 253} the conflagration without the comet; or the cave-life without both; or the age of darkness without something that filled the heavens with clouds; or the victory of the sun without the clouds, and the previous obscuration of the sun. If the reader takes the other alternative, that these legends are not fragments of a colossal falsehood, then he must concede that the earth, since man inhabited it, encountered a comet. No other cause or event could produce such a series of gigantic consequences as is here narrated. But one other question remains: Did the Drift material come from the comet? It could have resulted from the comet in two ways: either it was a part of the comet's substance falling upon our planet at the moment of contact; or it may have been torn from the earth itself by the force of the comet, precisely as it has been supposed that it was produced by the ice. The final solution of this question can only be reached when close and extensive examination of the Drift deposits have been made to ascertain how far they are of earth-origin. And here it must be remembered that the matter which composes our earth and the other planets and the comets was probably all cast out from the same source, the sun, and hence a uniformity runs through it all. Humboldt says: "We are 'astonished at being able to touch, weigh, and chemically decompose metallic and earthy masses which belong to the outer world, to celestial space'; to find in them the minerals of our native earth, making it probable, as the great Newton conjectured, that the materials which belong to one group of cosmical bodies are for the most part the same."[1] [1. "Cosmos," vol. iv, p. 206.] {p. 254} Some aërolites are composed of finely granular tissue of olivine, augite, and labradorite blended together (as the meteoric stone found at Duvets, in the department de l'Ardèche, France): "These bodies contain, for instance, crystalline substances, perfectly similar to those of our earth's crust; and in the Siberian mass of meteoric iron, investigated by Pallas, the olivine only differs from common olivine by the absence of nickel, which is replaced by oxide of tin." Neither is it true that all meteoric stones are of iron. Humboldt refers to the aërolites of Siena, "in which the iron scarcely amounts to two per cent, or the earthy aërolite of Alais, (in the department du Gard, France,) _which broke up in the water_," (clay?); "or, lastly, those from Jonzac and Juvenas, which contained _no metallic iron_."[2]