We have already said that among the Egyptians the arch was only of secondary importance; that it was only used in accessory parts of their buildings. We are compelled to return to the subject, however, because a wrong idea has generally been adopted which, as in the case of the monoliths, we must combat evidence in hand. The extreme antiquity of the arch in Egypt is seldom suspected. It was an article of faith with the architects of the last century that the arch was discovered by the Etruscans. The engineers of the French expedition did not hesitate to declare every arch which they found in Egypt to be no older in date than the Roman occupation. But since the texts have been interpreted it has been proved that there is more than one arch in Egypt which was constructed not only as early as the Ptolemies, but even under the Pharaohs. Wilkinson mentions brick arches and vaults bearing the names of Amenophis I., and Thothmes III. at Thebes, and judging from the paintings at Beni-Hassan, he is inclined to believe that they understood the principle as early as the twelfth dynasty.[79] [79] WILKINSON, _Manners and Customs_, etc., vol. i. pp. 357-358: vol. ii. pp. 262, 298-299. Wilkinson was quite right in supposing these eighteenth dynasty vaults to be from the first constructed by Egyptian architects. The scarcity of good timber must soon have set them to discover some method of covering a void which should be more convenient than flat ceilings, and as the supply always follows the demand, they must have been thus led towards the inevitable discovery. The latest editor of Wilkinson, Dr. Birch, affirms more than once that the arch has been recently discovered among the remains from the Ancient Empire, and in the _Itinéraire_ of Mariette we find:[80] "It is by no means rare to find in the necropolis of Abydos, among the tombs of the thirteenth and even of the sixth dynasty, vaults which are not only pointed in section as a whole, but which are made up of bricks in the form of _voussoirs_." Being anxious that no uncertainty upon such a subject should remain, we asked Mariette for more information during the last winter but one that he spent in Egypt. We received the following answer, dated 29th January, 1880: "I have just consulted my journal of the Abydos excavations. I there find an entry relating to a tomb of the sixth dynasty with the accompanying drawing (Fig. 44): _a_ is in limestone, and there can be no doubt that in it we have a keystone in the form of a true voussoir; _b_, _b_, are also of stone. The rest is made up of crude bricks, rectangular in shape, and kept in place by pebbles imbedded in the cement. [80] P. 148.