There is also a curious analogy in the progress of construction of these sea-going craft with the natural order in the construction of fishes, that is to say, if the ganoids are to be considered antecedent to the vertebrates among the latter. For in the case of the stitched vessels the hull is the first thing in time and construction, the ribs and framework being, so to speak, an afterthought, and attached to the interior when the hull has been completed, whereas the later and modern practice is to set up the ribs and framework of the vessel first and to attach the exterior planking afterwards. But the invention of trenails and dowels must have preceded the later practice, and have led the way to the building of such boats as those described by Herodotus (ii. 96), the ancestors of the Nile 'nuggur' of modern times. Ulysses, as a shipwright well skilled in his craft, uses axe and adze and auger, and with the latter makes holes in the timbers he has squared and planed, and with trenails and dowels ties them together. The wooden fastenings, be it remarked, are in size and diameter severally adapted, the first to resist the horizontal, the second to resist the vertical strain to which the raft would be exposed upon the waves. All this, we may observe, points to a stage anterior to that in which the use of metal nails and ties in ship- and boat-building had been introduced. Trenails and dowels are however still in use, and have a natural advantage over iron in the construction of wooden vessels, owing to the absence of corrosion, which in early times must have caused difficulties as to its employment for boat-building. Copper, on the other hand, though free from this objection, would be less available by reason of expense and the great demand for it for other purposes. And now we have reached a point where we enter upon the borders of history. No doubt, if we knew more about the venerable antiquity of China, we might be able to add interesting facts, showing the development from the earliest sanpan to the great river boats, and the growth of that curious art which produced the Chinese junk, a vessel undoubtedly of a very antique type. But this knowledge is not ours at present, and so we must turn to the equally venerable civilisation of Egypt for information upon the subject. In Egypt fortunately the tomb paintings have preserved to us a wealth of illustration of boats and ships, some of which, if we may trust the learned, take us back to dates as early as 3000 B.C. In turning over the interesting plates of such works as Lepsius's 'Denkmaeler,' or Duemichen's 'Fleet of an Egyptian Queen,' we are struck by the reflection that, if at that early date boats, and ships, and oars, and steering paddles, and masts, and sailing gear had all been brought to such a stage of perfection, we must allow many centuries antecedent for the elaboration of such designs, and for the evolution of the savage man's primary conception of canoe and paddle.