Some persons will perhaps be surprised to find the same ideas developed at length in several parts of the book. If they will carry their thoughts back to the date at which I wrote, they will recognize the necessity of such repetitions. Egyptologists, absorbed in the task of deciphering, had eyes for scarcely anything except the historical or religious literary texts; and so amateurs or inquirers, finding nothing in the works of experts to help them to any sound interpretation of the characteristic manifestations of Egyptian art, were reduced to register them without always understanding them, for lack of knowledge of the concepts that had imposed their forms on them. It is now admitted that such objects of art are above all utilitarian, and that they were originally commissioned with the fixed purpose of assuring the well-being of human survival in an existence beyond the grave. Thirty years ago, few were aware of this, and to convince the rest, it was necessary to insist continually on the proofs and to multiply examples. I might of course have suppressed a portion of them here, but had I done so, should I not have been reproached, and quite rightly, with misrepresenting and almost falsifying a passage in the history of the Egyptian arts? The ideas which govern our present conception did not at once reach the point where they now are. They came into being one after the other, and spread themselves by successive waves of unequal intensity, welcomed with favour by some, rejected by others. I had to begin over again a dozen times and in a dozen different ways before I obtained their almost universal acceptation. I was at first laughed at when I put forward the opinion that there was not one unique art in Egypt, identical from one extremity of the valley to the other except for almost imperceptible nuances of execution, but that there were at least half a dozen local schools, each with its own traditions and its own principles, often divided into several studios, the technique of which I tried to determine. In the end the incredulous rallied to my side, and it would have been bad grace on my part to leave out of the articles which helped to convert them, at least I hope so, the repetitions which led to their being convinced.