oblong hole, apparently for running a rope through to anchor or secure the vessel. There had been an outrigger, which was described by the workmen as adhering to it when first discovered, and the holes remain for receiving the pins by which it was fastened. About the centre are small rests inside the gunwale for the ends of a cross seat, and others for a broader seat are at the stern, both being projections formed by leaving the wood when the trunk was originally hollowed out into a boat. In this example the stern remains nearly in a perfect state. It consists of a board inserted in vertical grooves cut in each side, and received into a horizontal groove across, beyond which the bottom and sides project about eight inches. The other of these two canoes was chiefly remarkable for a circular hole in the bottom, stopped by a plug imbedded in very tenacious clay, evidently designed to admit of water shipped being run off when it was on shore. But the most curious, and indeed puzzling fact in regard to it, is that this plug is not of oak but of _cork_--a discovery suggestive of inquiries not easily answered satisfactorily.[45] In the month of September 1849 a fourth canoe was found at Springfield, at a depth of about 20 feet from the surface, and in the same bed of finely laminated clay as those already described. This, too, is hollowed out of the single trunk of an oak, only thirteen feet in length, but on either side of it lay two additional planks of curious construction, each of them pierced with an elongated hole, which appeared to have been made with some sharp tool. They indicate some ingenious contrivance of the ancient seaman, not improbably designed for use when the bold navigator ventured with his tiny barque into the open sea, to be applied somewhat in the way a Dutch lugger fends off the dashing waves from her lee. This boat differs from those previously discovered, in having a rounded bow both fore and aft. In some respects it might seem to be the most ancient of the whole, and could hardly accommodate more than one man. Its workmanship is extremely rude, and it bears obvious marks of having been hollowed by fire. Yet the wooden appendages found alongside of it suffice to prove that its maker was not unprovided with some efficient tools. Thus, within a comparatively brief period, nine ancient canoes have been found within this limited area, affording singular evidence that in the earliest ages in which the presence of a human population is discoverable, we also find abundant proofs of the art of navigation, where now space fails to accommodate the merchant fleets of the Clyde. To these notices may be added the discovery of the remains of an ancient boat of more artificial construction, which was dug up, about the year 1830, at Castlemilk, Lanarkshire. It measured ten feet long, by two broad, and was built of oak, secured by large wooden pins.[46]