Th crude bricks, dried simply in the sun, became disintegrated with time and fell into powder; the kiln dried bricks were carried off from the ruins of one building to be used in another. The few piers or fragments of wall which remain are confused and shapeless. A few blocks of stone, sometimes even a single chip of marble, is enough to enable us to tell the history of a building which has been long destroyed. Such a chip may be the only surviving fragment of the edifice to which it belonged, but it preserves the impression of the chisel which fashioned it, that is of the taste and individuality of the artist who held the chisel. We have nothing of the kind in the case of a brick. Bricks were almost always covered with a coat of stucco, so that nothing was required of them beyond that they should be of the right size and of a certain hardness. It is only by their inscriptions, when they have them, that the dates of these bricks can be determined; when they are without them they tell us nothing at all about the past. Sometimes a brick structure presents, from a distance, an imposing appearance, and the traveller approaches it thinking that he will soon draw all its secrets from it. But after carefully studying and measuring it he is forced to confess that he has failed. It has no trace of decoration, and it is the decoration of an ancient building which tells us its age, its character, and its purpose. Stone, even when greatly broken, allows mouldings to be traced, but bricks preserve nothing; they are as wanting in individual expression as the pebbles which go to make a shingly beech. Even if it had come down to us in a less fragmentary condition, the military architecture of Egypt would have been far less interesting than that of Greece. The latter country is mountainous; the soil is cut up by valleys and rocky hills; the Greek towns, or, at least, their citadels, occupied the summits of rocky heights which varied greatly in profile and altitude. Hence the military architecture of the country showed great diversity in its combinations. In Egypt the configuration of the soil was not of a nature to provoke any efforts of invention or adaptation. All the cities were in the plain. Fortified posts were distinguished from one another only by the greater or less extent, height, and thickness of their walls. We shall, however, have to call attention to the remains of a few defensive works which, like those established to guard the defiles of the cataracts, were built upon sites different enough from those ordinarily presented by the Nile valley. In these cases we shall find that the Egyptian constructors knew how to adapt their military buildings to the special requirements of the ground.