little town of HILLAH, situated nearest to the site of the ancient capital, is built almost entirely with bricks from one single mound, that of KASR--once the gorgeous and far-famed palace of Nebuchadnezzar, whose name and titles thus grace the walls of the most lowly Arab and Turkish dwellings. All the other mounds are similarly used, and so far is the valuable mine from being exhausted, that it furnishes forth, to this day, a brisk and flourishing trade. While a party of workmen is continually employed in digging for the available bricks, another is busy conveying them to Hillah; there they are shipped on the Euphrates and carried to any place where building materials are in demand, often even loaded on donkeys at this or that landing-place and sent miles away inland; some are taken as far as Baghdad, where they have been used for ages. The same thing is done wherever there are mounds and ruins. Both Layard and his successors had to allow their Arab workmen to build their own temporary houses out of ancient bricks, only watching them narrowly, lest they should break some valuable relic in the process or use some of the handsomest and best-preserved specimens. [Illustration: 8.--VIEW OF NEBBI YUNUS] 4. No construction of bricks, either crude or kiln-dried, could have sufficient solidity without the help of some kind of cement, to make them adhere firmly together. This also the lowlands of Chaldea and Babylonia yield in sufficient quantity and of various qualities. While in the early structures a kind of sticky red clay or loam is used, mixed with chopped straw, bitumen or pitch is substituted at a later period, which substance, being applied hot, adheres so firmly to the bricks, that pieces of these are broken off when an attempt is made to procure a fragment of the cement. This valuable article was brought down by water from IS on the Euphrates (now called HIT), where abundant springs of bitumen are to this day in activity. Calcareous earth--i.e., earth strongly mixed with lime--being very plentiful to the west of the lower Euphrates, towards the Arabian frontier, the Babylonians of the latest times learned to make of it a white mortar which, for lightness and strength, has never been surpassed. [Illustration: 9.--BUILDING IN BAKED BRICK (MODERN). (Perrot and Chipiez.)]