To resume, dolmens, called _Hünengräber_ in Germany, _stazzona_ in Corsica, _antas_ in Portugal, and _stendos_ in Sweden, have all alike one large flat horizontal slab placed on two or more upright unhewn stones. This is the one fixed rule; local circumstances, perhaps even the caprice of the builders, decided the position and the mode of erection. Often, as I have already remarked, dolmens are buried beneath tumuli, but exceptions to this are numerous. General Faidherbe, after having examined more than six thousand dolmens in Algeria, affirms that the greater number have never been covered with earth.5 In the Orkney Islands there are more than one hundred dolmens without tumuli, and Martinet failed to find any trace of mounds in Berry. In Scotland and Brittany we find dolmens buried, not beneath mounds of earth, but under accumulations of pebbles, called _cairns_ in Scotland and _galgals_ in Brittany. However minor details may vary, and they do vary infinitely, one main idea everywhere dominated the builders, and that was the desire to protect from all profanation the resting-place of what had once been a human being. Cromlechs are circles of upright stones often surrounding dolmens or tumuli. Sometimes they form single circles, and at others two, three, or even seven separate enclosures. They are common in Algeria, Sweden, and Denmark, and in the last-named country two kinds are distinguished: the _langdyssers_, which form an ellipse, and the _rundyssers_ which form a perfect circle. In other countries cromlechs are slot so numerous; there are but few in France, of which we may name those of Kergoman (Morbihan), Lestridion in Plomeur, and Landaondec in Crozon (Finistère). The last-named, known its _le temple des faux dieux_, is closed by a double row of small menhirs. In Italy, the only cromlechs known are those of Sesto-Calende and those of the plateau of Mallevalle near Ticino. One of the latter still retains in their original position fifty-nine huge granite blocks, forming a circular enceinte, a semicircle, and an entrance avenue. A few leagues from the ancient Tyre can still be seen a circle of upright stones. Ouseley describes another at Darab, in Persia; a missionary speaks of three large circles at Khabb, in Arabia, which circles he compares with those at Stonehenge; and Dr. Barth tells us of a cromlech between Mourzouk and Ghât.