Besides, more complex circular and spiral decorations, in the form of the well-known guilloche and scroll, were made use of in Egypt during the sixth dynasty, or immediately after the Memphite dynasty that reared the larger Pyramids of Gizeh. Thus, speaking of the ancient Egyptian architectural decorations, Sir J. Gardner Wilkinson observes--"The Egyptians did not always confine themselves to the mere imitation of natural objects for ornament; and their ceilings and cornices offer numerous graceful fancy devices, among which are the guilloche, miscalled Tuscan borders, the chevron, and the scroll patterns. They are to be met with in a tomb of the time of the sixth dynasty; they are therefore known in Egypt many ages before they were adopted by the Greeks, and the most complicated form of the guilloche covered a whole Egyptian ceiling, upwards of a thousand years before it was represented on those comparatively late objects found at Nineveh."--_Popular account of the Ancient Egyptians,_ ii. 290. III.--ERA OF THE ARABIAN HISTORIAN, IBN ABD AL HAKM. (_Page_ 236.) Professor Smyth owns that the grooves and pin holes which the coffer in the King's Chamber presents, were (to use his own words) "in fact to admit a sliding sarcophagus cover or lid" (see _ante_, p. 236, footnote). But in his recent communication to the Royal Society on the 20th April, he doubted Al Hakm's account of the mummy having been actually found in the sarcophagus when the King's Chamber was first entered by the Caliph Al Mamoon, in the ninth century, arguing, on the authority of a Glasgow gentleman, that the historian himself, Al Hakm, did not live for three or four centuries afterwards, and, therefore, could not be relied upon. But all this reasoning or assertion is simply a mistake. In a late letter (7th April), Dr. Rieu of the British Museum,--the chief living authority among us on any such Arabic question,--writes, "The statement relating to Al Mamoon's discovery could hardly rest on a better authority than that of Ibn Abd Al Hakm; for not only was he a contemporary writer (having died at Old Cairo, A.H. 269, that is, thirty-eight years after Al Mamoon's death), but he is constantly quoted by later writers as an historian of the highest authority. You will find a notice of him in Khallikan's _Biographical Dictionary_, vol. ii. etc." He was a native of Egypt, and chief of the Shafite sect. Born in A.D. 799, he died in A.D. 882, or at the age of 83. IV.--LENGTH OF THE SARCOPHAGUS IN THE KING'S CHAMBER. (_Page_ 236.)