campaign as if he had already heard the story in Mexico; while other contemporary writers say nothing of them, but mention a large river that emptied into the Southern Sea, which the inhabitants had barred with an iron chain. Neither the seven cities nor the broad river with its barrier chain were found by Cebreros and Alcáraz.
It is proper, therefore, to inquire whether, or to what extent, a story concerning the seven cities existed among the natives of Mexico before the arrival of the Europeans. But such an inquiry should be prefaced by this statement of general fact: Wherever it is possible to follow the development of popular legends in groups of men not acquainted with writing, but who have been taught to transmit these stories by verbal tradition from generation to generation, we are surprised at finding that the legend has been preserved with careful fidelity through centuries, and that any novelty or change which has been introduced into it must always be ascribed to foreign influence. Such influence is not necessarily to be attributed to an extra-continental contact; but where such a contact takes place—and where, as everywhere in America, one group of the human race is suddenly caused to live with another of whom it is so far in advance in established historical foundations and knowledge, and in the means of perpetuating the remembrance of them, as the Europeans of the sixteenth century were then in advance of the American aborigines all over the continent without exception; and where this living in contact is at the same time combined with the exercise of a religious influence by the superior race on the other—then a recon-
