Let us now inquire into the physical aspects of the Deluge, as they are said to have presented themselves to the ancient witness or witnesses to whom we owe the Biblical account of the catastrophe, and endeavour to ascertain if they have any agreement with the conditions of the great post-glacial Deluge of geology. Let it be observed here that we are dealing not with prehistoric events but with a written history, supposed by some to have been compiled from two contemporary documents, and corroborated by the testimony of the ancient Chaldean tablets copied by the scribes of Assurbanipal, apparently from different originals, preserved in very ancient Chaldean temples. The preparation of an ark or ship, and the accommodation therein, not only of Noah and his family, but of a certain number of animals, is a feature in which most Deluge narratives agree. This implies a considerable advance in the arts of construction and navigation, but not more than we have a right to infer from the perfection of these arts in early postdiluvian times, when it can scarcely be supposed that the new communities of men had fully regained the position of their ancestors before the destruction caused by the great Flood. Lenormant, however, remarks here: 'The Biblical narrative bears the stamp of an inland nation, ignorant of things appertaining to navigation. In Genesis the name of the ark, Têbâh, signifies "chest," and not "vessel"; and there is nothing said about launching the ark on the water; no mention either of the sea, or of navigation, or any pilot. In the Epopee of Uruk, on the other hand, everything indicates that it was composed among a maritime people; each circumstance reflects the manners and customs of the dwellers on the shores of the Persian Gulf. Hasisadra goes on board a vessel, distinctly alluded to by its appropriate appellation; this ship is launched, and makes a trial-trip to test it: all its chinks are calked with bitumen, and it is placed under the charge of a pilot.'