[Illustration: Fig. 138.--Passage-Tomb at Plouharnel (Morbihan).] The authors who have written on the question we are now considering, especially Sir J. Lubbock in his work on 'Pre-historic Times,' and Nilsson, the Swedish archæologist, have given a much too complicated aspect to their descriptions of the tombs of pre-historic ages, owing to their having multiplied the distinctions in this kind of monument. We should only perplex our readers by following these authors into all their divisions. We must, however, give some few details about them. [Illustration: Fig. 139.--Passage-Tomb; the so-called _Table de César_, at Locmariaker (Morbihan).] Sir J. Lubbock gives the name of _passage grave_, to that which the northern archæologists call _Ganggraben_ (tomb with passages); of these we have given four representations (figs. 136, 137, 138, 139), all selected from specimens in France. This name is applied to a passage leading to a more spacious chamber, round which the bodies are ranged. The gallery, formed of enormous slabs of stone placed in succession one after the other, almost always points towards the same point of the compass; in the Scandinavian states, it generally has its opening facing the south or east, never the north. The same author gives the name of _chambered tumuli_ (fig. 140) to tombs which are composed either of a single chamber or of a collection of large chambers, the roofs and walls of which are constructed with stones of immense size, which are again covered up by considerable masses of earth. This kind of tomb is found most frequently in the countries of the north. Fig. 140 represents, according to Sir J. Lubbock's work, a Danish _chambered tumulus_. [Illustration: Fig. 140.--A Danish _Tumulus_, or chambered Sepulchre.] Before bringing to a close this description of megalithic monuments, we must say a few words as to _menhirs_ and _cromlechs_. _Menhirs_ (fig. 141) are enormous blocks of rough stone which were set up in the ground in the vicinity of tombs. They were set up either separately, as represented in fig. 141, or in rows, that is, in a circle or in an avenue. [Illustration: Fig. 141.--Usual shape of a _Menhir_.] There is in Brittany an extremely curious array of stones of this kind; this is the range of _menhirs_ of Carnac (fig. 142). The stones are here distributed in eleven parallel lines, over a distance of 1100 yards, and, running along the sea-shore of Brittany, present a very strange appearance. [Illustration: Fig. 142.--The rows of _Menhirs_ at Carnac.]