No doubt the object of Moses in promulgating that law was to preserve cleanliness about camp and to hide offensive matter from sight in the least odorous way. Nevertheless no more sanitary method could have been adopted. Deposited as the soil was, in small quantities, just underneath the surface of the ground it was soon reduced to harmless compounds by the teeming bacteria in the living earth. Recent explorations in Jerusalem have brought to light extensive drains for the removal from the vicinity of the temples of offensive matters peculiar to the bloody sacrifices of that ancient people; and in an August, 1905, issue of the _Scientific American_, Edgar James Banks, field director of the Babylonian expedition of the University of Chicago, gives an interesting description of house drains and sewage disposal wells constructed at Bismya some 4,500 years ago. The following account is abstracted from that article: "Babylonia is perfectly level. From Bagdad to the Persian Gulf there is not the slightest elevation save for the artificial mounds or an occasional changing sand drift. In most places there is a crust of hard clay upon the surface, baked by the hot sun of summer time so hard that it resembles stone. Beneath the crust, which at Bismya is seldom more than 4 feet in thickness and in places entirely lacking, is loose caving sand reaching to an unknown depth. "Drainage in such a country, without sloping hills or streams of running water, might tax the ingenuity of the modern builder. In constructing a house, the ancient Sumerian of more than 6,000 years ago first dug a hole into the sand to a considerable depth. At Bismya several instances were found where the shaft had reached the depth of 45 feet beneath the foundation of the house. From the bottom he built up a vertical drain of large cylindrical terra cotta sections, each of which is provided with grooved flanges to receive the one above. The sections of one drain were about 19 inches in diameter and 23½ inches in height; others were larger and much shorter. The thickness of the wall was about 1.06 inches. The tiles were punctured at intervals with small holes of about ¾ inch in diameter. The section at the top of the drain was semi-spherical, fitting over it like a cap and provided with an opening to receive the water from above. Sand and potsherds were then filled in about the drain and it was ready for use. The water pouring into it was rapidly absorbed by the sand at the bottom, and if there it became clogged the water escaped through the holes in the sides of the tiles.