Even these small chambers were intended for long use, and to contain more than one body; some contain the remains of a dozen. The bones lie in layers covered with flint chips, or in little heaps where they have been collected to give room for new interments. Many of the smaller chambers were too short to allow the body to lie fully extended; in some it was evidently placed in a sitting posture leaning against the wall. These smaller dolmens were surrounded by a heap of earth reaching nearly to the top of the side stones, but not covering the roof, and hardly deserving to be called a tumulus. The roof was usually composed of one great stone, flat below but arching above and forming a sort of monument. In one chamber this roof-stone is eleven feet long and three feet thick. On each side of the doorway a stone is often set upright to keep back the earth of the tumulus, and a covering stone may be laid across them. Here we have a form intermediate between the small dolmen without entrance-stones and the large chambers, which we shall consider later. The earthern tumulus may be round in outline or elliptical, forming the long grave--the _Hunnenbett_ of popular German speech. The round tumuli rarely exceed 40 feet in diameter. They were as a rule surrounded by a circle of upright stones, now generally removed. The long tumuli are rarely more than 5 or 6 feet high, and 20 to 30 feet wide. The length varies greatly: usually between 50 and 100 feet, but infrequently from 100 to 200 feet; one is 500 feet long with over 100 of the marginal stones still standing. The chambers in the round and long tumuli in Denmark are very similar, but in the long tumuli there are usually two or more dolmens, often symmetrically located. In other cases it looks as if a tumulus had been lengthened to cover chambers added later. A large amount of variety in such details is not surprising. More rarely we find two or more small tumuli side by side, each with one or two chambers. That those smaller dolmens or chambers are the oldest is suggested not only by their simplicity but even more by the pottery and implements contained in them, though this is not invariably true, as the small dolmens continued in use throughout the Neolithic period, in some regions far later. The gifts which they contain are usually not numerous and often very scanty. [Illustration: "CROUCHING BURIAL" (HOCKER-BESTATTUNG) ADLERBORG, NEAR WORMS] [Illustration: MENHIR, CARNAC, BRITTANY] [Illustration: DOLMEN, HAGA, ISLAND OF BORUST]