A steady phalanx of swamp cedars pushes its foothold farther and farther out upon it, year by year, scouting with button bush and black alder and holding every inch that they obtain for it. Now and then something happens to a brief area of marsh grass and cranberries so that their dense packed minions faint and release their root grip on the quaking mud. Every such opening is seized by the alder or the button bush, and the cedars follow them; indeed, sometimes the cedars, favored by the right wind or the right bird carriers at seeding time, slip in first, and little island clumps of their dark bronze green stand here and there over against the cadet blue of Blue Hill which hangs like a beautiful drop-curtain always on the westerly sky. Once, a half-century ago or more, a farmer and his men came down from the pastures, and for purposes of their own cut a ditch straight through the middle of the bog to the open water. The hundreds of scrawny night herons, sitting on pale blue eggs in scraggly nests in the cedar swamp must have heard the cedars laugh as this went on. It was the swamp’s opportunity. Where the farmer and his men with incredible labor cut and tore away the marsh-grass roots the cedars planted their seeds, and called upon the alders and the swamp maples and the thoroughwort, the Joe Pye weed, and a host of other good citizens of the swamp, to help them. So vigorous was the sortie and so well did they hold their ground that you may trace the farmer’s wide ditch to-day only as a causeway down which the swamp has come to build a great wooded area in the midst of the bog, accomplishing in half a century what it might not have done in five times that had it not been for human aid. Thus, slowly as you and I count time, only an inch or two a year perhaps, yet all too rapidly for the joy of future generations, the bog encroaches upon the pond and the swamp follows towards complete possession, which as the centuries go by will make the quaking sphagnum firm meadow land. For all you and I know, the Metropolitan Park Commission of the year 3908 will be fixing up a second Franklin Field here for the camping ground of visiting Pythians. Meanwhile let us hasten to enjoy our bog and its reedy borders. It is the home and the occasional resting place of many a wild free creature. Of a clear midsummer evening you may hear the muskrat grubbing roots there, see, perhaps, the moonlight glint on the long V-shaped ripple which he makes as he swims, and hear his snort and splash when he dives at sudden sight of you. You may chance upon a disconsolate bittern sitting clumsily in dumpy patience as he waits for food to splash up to him, and you may even hear him work his wheezy, dislocated wooden pump, a cry as awkward and disconsolate as the bird. [Illustration: Of a clear midsummer evening you may hear the muskrat grubbing roots there ... and hear his snort and splash when he dives at sudden sight of you]