It remains for us to show the use which the Egyptians made of their superiority in doing more honour to their dead, in guarding them more safely against the chances which might shorten the duration or destroy the happiness of their life in the tomb. The fulfilment of this duty was, as the Greek travellers rightly affirmed, their chief pre-occupation. Their sepulchral architecture was, of all their creations, the most original and the most characteristic of their genius, especially in the forms which we find in the cemeteries of the Ancient Empire. In the time of the New Empire, at Thebes, it is less complete and homogeneous. In the latter the arrangement and decoration do not spring, as a whole, from a unique conception; we find traces in it of new hypotheses and novel forms of belief. These do not supersede the primitive ideas; they are added to them, and they bear witness to the restless efforts made by human thought to solve the problem of human destiny. These apparent contradictions and hesitations are of great interest to the student of the Egyptian religion, but from the art point of view the Memphite tombs are more curious and important than those of later date. They have the great merit of being complete in their unity both of artistic form and of intellectual conception. They are the offspring of a single growth, and are perfect in their clear logical expression. And again, they are the type of all the later tombs, of those at Abydos, at Beni-Hassan, and at Thebes. Certain details, indeed, are modified, but the general disposition remains the same to the end. We shall, therefore, find the ruling principle of Egyptian sepulchral architecture most clearly laid down in the cemeteries of Gizeh and Sakkarah.