Admired by the students of pre-historic physical geography, these boulder-stones are prized and sought for by the inhabitants of this wide tract of rockless plains. Though hard and intractable beneath the chisel and hammer, these hard granitic and metamorphic masses are the only durable building materials which are within their reach. Hence all solid constructions are formed of them, and the houses of wood generally stand on a substratum of these more lasting stones. In this way the traveller sees them employed in town, village, and farm. Palace, fortress, and cottage are equally indebted to the antediluvian icebergs of the old-world Baltic. And thus near the ancient towns, and wherever frequent people live, few of the unmoved boulders catch the traveller’s eye as he rides over the unenclosed plains around them. But they occur singly, in groups, and in rapid succession, when he penetrates to the less-peopled interior, or explores the primeval forests, or where railway cuttings dip deeply into the drift, or clay-beds are worked for economical purposes, as we see them in the vicinity of Berlin. Stettin, well known to our Baltic merchants and shipowners, and famed among the fortresses of Germany, stands near the mouth of the Oder—where the river, escaping from the long flats through which it has wound its slow way, is about to expand into a broad lake. This lake, called the Haaf, would in reality be a wide firth or arm of the sea, were it not that its mouth is blocked up by the islands of Usedom and Wollin, which leaves three channels for the escape of the waters of the Oder. The central channel, called the Swine, is the deepest and most used; but all are difficult and narrow, and easy of defence against attacks by sea. The Silesian commerce has its principal outlet by the Oder, which connects Stettin with Frankfort-on-the-Oder and with Breslau. Above the town of Stettin, for the two or three last miles, the river winds, and again and again returns upon itself, through the almost perfect flat—and even throws off several small arms, which flow to the Haaf through channels of their own, before the main stream passes the city. To look down upon these windings from the tower of the old palace, when the bright morning sun rests upon the valley, reminded us of the winding Forth, as it is seen by thousands yearly from the beautiful summits of our well-beloved Ochil Hills. Beyond this distance the whole valley on either side is hemmed in by a lofty natural embankment of sand and gravel, the ancient limits of the Haaf when the land was lower and its waters covered the whole flat. The embankment which thus girdles the valley, and skirts at a distance the river flanks, consists for the most part of a ridge of ancient downs, such as we see on our own sandy shores where sea-born winds blow often inland; which hide Flemish towns and steeples from the eyes of the passing sailor; and which in Holland occur