The tubular structure which succeeded the trestle-work bridge did not retain its position very long. The pier at its western extremity was undermined by the water during a spring freshet, and gave way. The bridge, of course, fell down into the swirling tide below, and was carried bodily away, looking like a second Ark as it floated along towards the mouth of the river, where at length it stranded and became a wreck. On the breaking up of the ice every spring the Don, as is well known, becomes a mighty rushing river, stretching across from hill to hill. Ordinarily, it occupies but a small portion of its proper valley, meandering along, like an English tide-stream when the tide is out. The bridge carried away on this occasion was notable so long as it stood, for retaining visible marks of an attempt to set fire to it during the troubles of 1837. The next appliance for crossing the river was another tubular frame of timber, longer than the former one; but it was never provided with a roof, and never closed in at the sides. Up to the time that it began to show signs of decay, and to require cribs to be built underneath it in the middle of the stream, it had an unfinished, disreputable look. It acquired a tragic interest in 1859, from being the scene of the murder, by drowning, of a young Irishman named Hogan, a barrister, and, at the same time, a member of the Parliament of Canada. When crossing the high trestlework which preceded the present earth-bank, the traveller, on looking down into the marsh below, on the south side, could see the remains of a still earlier structure, a causeway formed of unhewn logs laid side by side in the usual manner, but decayed, and for the most part submerged in water, resembling, as seen from above, some of the lately-discovered substructions in the lakes of Switzerland. This was probably the first road by which wheeled vehicles ever crossed the valley of the Don here. On the protruding ends of some of the logs of this causeway would be always seen basking, on a warm summer's day, many fresh-water turtles; amongst which, as also amongst the black snakes, which were likewise always to be seen coiled up in numbers here, and among the shoals of sunfish in the surrounding pools, a great commotion would take place when the jar was felt of a waggon passing over on the framework above. The rest of the marsh, with the exception of the space occupied by the ancient corduroy causeway, was one thicket of wild willow, alder, and other aquatic shrubbery, among which was conspicuous the _spiræa_, known among boys as "seven-bark" or "nine-bark" and prized by them for the beautiful hue of its rind, which, when rubbed, becomes a bright scarlet.