The Mill Pond, it is said, included about fifty acres,--nearly as large as the north end island,--and, of course, must have furnished during the time it was available--from an hour or two after full tide until an hour or two before the next tide, night and day--a very large and extensive water-power, and was, no doubt, though probably not half used, a very valuable property. It is stated by Drake, as if it were a consequence of the action of the committee, that, "four years after the above report, a committee took possession of the premises, as having reverted to the town." These proceedings, it will be noticed, all refer to the "mill-pond mills," but may be presumed to include the pond and the whole grant made in 1643; so that in 1769 the property was in the hands of the town, as appears from these statements. After this time, by some means or other, the Mill Pond Company, or Corporation, came into possession of the property, as Shaw says, "for the consideration of five dollars;" and in 1807, the town became a partner in the matter of tilling it up, the town to have the streets, we presume, and one-eighth of the lots filled within twenty years. Permission was also given to use the gravel of Beacon Hill for the purpose. The filling was completed more than fifty years ago, and the entire space has long been covered with buildings, and in 1832 included a theatre. The Boston and Maine Railroad Station stands over the creek; and the large depot buildings of the Fitchburg, Eastern, and Lowell Railroads are all on land taken from the river outside the ancient causeway: so that no one of the great railroad depots in the city stands upon the original land of the town. CONCLUSION. Thus we have seen what were the features and topographical characteristics of the original peninsula which forms the groundwork, as it were, of the city proper of to-day. In the steady march of progress and improvements which have marked its growth for two hundred and fifty years, such changes and enlargements have been made, that neither its early outlines or its original shape are any where to be observed. The great coves on either side of the town have disappeared; and the renowned Tri-mountain, around which so much of history gathered, and so much of puritanism and patriotism were enshrined, is shorn of its ancient prestige, although still, as it were, the summit of State authority; and of "Corne Hill," whereon the settlers of Boston, Charlestown, Roxbury, and Dorchester, in 1632, built the first fort for the defence of the settlement, not a vestige now remains.