But, on the other hand, those that come from cemeteries are very numerous. Every tomb that was somewhat cared for in the ancient or new empire contained several which represented the defunct alone, or accompanied by the principal members of his family. They were not always placed in the same spot: in the IVth Dynasty they were sometimes placed in the outer court, in the open air, sometimes also in the chapel, where on certain days the family celebrated the worship of the ancestor. Most often they were imprisoned in a narrow chamber, with a lofty ceiling, something like a corridor, and for that reason called _Serdâb_ by the Arabs. Sometimes the _Serdâb_ is lost in the masonry and does not communicate with any of the other chambers. Sometimes it is connected with the funerary chapel by a sort of quadrangular pipe, so small that a hand can scarcely be inserted.[15] The priests would burn incense near the orifice, pour libations, present offerings, murmur prayers, and everything was supposed to penetrate to the little apartment. Some of these _Serdâb_ contained one or two statues at most, others would contain twenty. Some are in wood or hard stone, but the greater number are in painted limestone. Seated or standing, crouching or in the attitude of walking, they all claim to be portraits--portraits of the dead man, of his wife, of his children, of his servants. If they were more often found in places where they would have been visible, their presence would be explained by the pleasure members of a family would feel in seeing the features of those they had loved. But they are generally walled up for all eternity in hidden corners where no one would ever penetrate: we must seek other reasons.