rise after excessive falls of rain, so the pressure of the extremities of the rainbow upon its surface would prevent its exceeding its proper level."[I-37] [Sidenote: THE TOWER OF BABEL.] Many of these flood-myths are supplemented with an account of an attempt to provide against a second deluge, by building a tower of refuge, resembling more or less closely the biblical legend of the tower of Babel. Thus a Cholultec legend relates that all the giants who inhabited the country, save seven, were destroyed by a great flood, and adds that when the waters were assuaged, one of these seven began to build an artificial mountain. But the anger of the gods was aroused, and they slew many of the builders, so the work was stopped.[I-38] In like manner, in the Pápago legend to which I have referred, Montezuma, after he and the Coyote had been saved from the flood, so incensed the Great Spirit by his ingratitude and presumption, that an insect was sent flying to the east to bring the Spaniards, who, when they came, utterly destroyed Montezuma. After the deluge spoken of in the Lake Tahoe myth, the few who escaped built up a great tower, the strong making the weak do the work. This, it is distinctly stated, they did that they might have a place of refuge in case of another flood. But the Great Spirit was filled with anger at their presumption, and amidst thunderings and lightnings, and showers of molten metal, he seized the oppressors and cast them into a cavern.[I-39] These myths have led many writers to believe that the Americans had a knowledge of the tower of Babel, while some think that they are the direct descendants of certain of the builders of that tower, who, after the confusion of tongues, wandered over the earth until they reached America.[I-40] Many of the tribes had traditions through which they claim to have originally come from various directions to their ultimate settling-place in America. It will be readily seen that such traditions, even when genuine, are far too vague and uncertain to be of any value as evidence in any theory of origin. To each tribe its own little territory was the one important point in the universe; they had no conception of the real size of the world; most of them supposed that after a few days' journey the traveler could if he chose jump off the edge of the earth into nothingness. What their traditions referred to as a 'country in the far east,' would probably mean a prairie two hundred miles away in that direction. Nevertheless, as these traditions have been thought to support this or that theory, it will be well to briefly review them here.[I-41] [Sidenote: ORIGIN OF THE TOLTECS.]