Retracing our steps; placing ourselves again on the bridge, and, turning northwards, we see on the right, near by, a field or rough space, which has undergone excavation, looking as though the brick-maker or potter had been at work on it: and we may observe that large quantity of the displaced material has been spread out over a portion of the marshy tract enclosed here by a bend of the river westward. What we see is a relic of an effort made long ago, by Mr. Washburn, a barrister of York, to whom reference has been made before, to bring this piece of land into cultivation. In its natural state the property was all but useless, from the steepness of the hill-side on the one hand, and from the ever wet condition of the central portion of the flat below on the other. By grading down the hill and filling in the marsh, and establishing a gentle slope from the margin of the stream to the level of the top of the bank on the right, it was easy to see that a large piece of solid land in an eligible position might be secured. The undertaking, however, was abandoned before the work was finished, the expense probably being found heavy, and the prospect of a return for the outlay remote. At a later period Mr. O'Neill, with greater success and completeness, cut down the steep ridges of the bank at Don Mount, a short distance up, and filled in the marsh below. These experiments show how the valley of the Don, along the eastern outskirts of the town, will ultimately be turned to account, when the necessities of the population demand the outlay. At present such improvements are discouraged by the length of time required to cover large surfaces of new clay with vegetable mould. But in future years it will be for mills and factories, and not for suburban and villa purposes, that the parts referred to will be held valuable. These marshes along the sides of the Don, from the point where its current ceases to be perceptible, appear to be remains of the river as it was at an epoch long ago. The rim or levee that now, on the right and left, confines and defines the meanderings of the stream in the midst of the marshes, has been formed by the alluvial matter deposited in the annual overflowings. The bed of the stream has probably in the same manner been by degrees slightly raised. The solid tow-path, as it were, thus created on each side of the river-channel, affords at present a great convenience to the angler and fowler. It forms, moreover, as shown by the experiments above alluded to, a capital breastwork, towards which the engineer may advance, when cutting down the adjoining hills, and disposing of their material on the drowned land below.