same roughness of execution, the same strange types, the same disorder in the arrangement of the signs, and the same care to preserve the surface of the block in its natural condition. [Illustration: 68.] Sculptures on the menhirs of the covered avenue of Gavr’innis. There has been a good deal of discussion about the orientation of megalithic monuments, and the truth on that point once ascertained, some light might be thrown on the aim of the builders. It is evident, however, that there never was any general system of orientation. The dolmens of Morbihan, it is true, nearly all face the east, doubtless in homage to the sun rising in its splendor; but this is not the case in Finistère, and the dolmens of Kervinion and Kervardel, for instance, are set due north and south. Leaving Brittany, we are told by the Rev. W. Lukis that the position of the megalithic monuments of England varies considerably: most of the dolmens of Berry, Poitou, Aveyron, and the island of Bornholm, face west; and those of Algeria are set southwest, and northeast, so that it is really impossible to come to any final conclusion. Some of the megalithic monuments already noticed have a peculiarity to which we must refer here on account of its importance. One of the supports, in nearly every case that which closes the entrance, is pierced with a circular opening. Sometimes, however, the opening is elliptical or square. [Illustration: 69.] Dolmen with opening (India). We meet with dolmens thus distinguished in India (Fig. 69), in Sweden, in Algeria, in France, and in Palestine, where they are often associated with sepulchral niches hewn out of the rock and also pierced with an opening corresponding with that of the entrance. In Alemtejo (Spain), square openings occur. West of Karleby in Sweden, is a sepulchral chamber about twenty-nine feet long, made of slabs set upright, all those facing south being pierced with a nearly circular opening; and on the shores of the Black Sea dolmens made of four upright stones surmounted by a slab, have, in every case, one of the uprights pierced with an artificial opening about six inches in diameter. These dolmens are said by the country people to have been set up by a race of giants who built them as shelters for a dwarf people on whom they had compassion. [Illustration: 70.] Dolmen near Trie (Oise).