It has been sometimes suggested that the ark was a huge raft with a superstructure, or house, built on it, of the dimensions given above. There does not, however, appear to be the slightest reason for concurring with this suggestion. On the contrary, the biblical account of the structure of the ark is so detailed, that we have no right to suppose that the description of the most important part of it, the supposed raft, to which its power of floating would have been due, would have been omitted. Moreover, the whole account reads like the description of a ship-shaped structure. SHIPBUILDING IN EGYPT. The earliest information on the building of ships is found, as might be expected, on the Egyptian tombs and monuments. It is probable that the valley of the Nile was also the first land bordering on the Mediterranean in which ships, as distinguished from more elementary craft, were constructed. Everything is in favour of such a supposition. In the first place, the country was admirably situated, geographically, for the encouragement of the art of navigation, having seaboards on two important inland seas which commanded the commerce of Europe and Asia. In the next place, the habitable portion of Egypt consisted of a long narrow strip of densely peopled, fertile territory, bordering a great navigable river, which formed a magnificent highway throughout the whole extent of the country. It is impossible to conceive of physical circumstances more conducive to the discovery and development of the arts of building and navigating floating structures. The experience gained on the safe waters of the Nile would be the best preparation for taking the bolder step of venturing on the open seas. The character of the two inland seas which form the northern and eastern frontiers of Egypt was such as to favour, to the greatest extent, the spirit of adventure. As a rule, their waters are relatively calm, and the distances to be traversed to reach other lands are inconsiderable. We know that the ancient Egyptians, at a period which the most modern authorities place at about 7,000 years ago, had already attained to a very remarkable degree of civilisation and to a knowledge of the arts of construction on land which has never since been excelled. What is more natural than to suppose that the genius and science which enabled them to build the Pyramids and their vast temples and palaces, to construct huge works for the regulation of the Nile, and to quarry, work into shape, and move into place blocks of granite weighing in some cases several hundreds of tons, should also lead them to excel in the art of building ships? Not only the physical circumstances, but the habits and the religion of the people created a demand, even a necessity, for the existence of navigable floating structures. At the head of the delta of the Nile was the ancient capital, the famous city of Memphis, near to which were built the Pyramids, as tombs in which might be preserved