With the progress of archaeological research, it becomes daily more evident that the whole of the North Mongol domain, from Finland to Japan, has passed through the Stone and Metal Ages, like most other habitable parts of the globe. During his wanderings in Siberia and Mongolia in the early nineties, Hans Leder[578] came upon countless prehistoric stations, kurgans (barrows), stone circles, and many megalithic monuments of various types. In West Siberia the barrows, which consist solely of earth without any stone-work, are by the present inhabitants called _Chudskiye Kurgani_, "Chudish Graves," and, as in North Russia, this term "Chude" is ascribed to a now vanished unknown race which formerly inhabited the land. To them, as to the "Toltecs" in Central America, all ancient monuments are credited, and while some regard them as prehistoric Finns, others identify them with the historic Scythians, the Scythians of Herodotus. There are reasons, however, for thinking that the Chudes may represent an earlier race, the men of the Stone Age, who, migrating from north Europe eastwards, had reached the Tom valley (which drains to the Obi) before the extinction of the mammoth, and later spread over the whole of northern Asia, leaving everywhere evidence of their presence in the megalithic monuments now being daily brought to light in East Siberia, Mongolia, Korea, and Japan. This view receives support from the characters of two skulls found in 1895 by A. P. Mostitz in one of the five prehistoric stations on the left bank of the Sava affluent of the Selenga river, near Ust-Kiakta in Trans-Baikalia. They differ markedly from the normal Buryat (Siberian Mongol) type, recalling rather the long-shaped skulls of the South Russian kurgans, with cephalic indices 73.2 and 73.5, as measured by M. J. D. Talko-Hryncewicz[579]. Thus, in the very heart of the Mongol domain, the characteristically round-headed race would appear to have been preceded, as in Europe, by a long-headed type. In East Siberia, and especially in the Lake Baikal region, Leder found extensive tracts strewn with kurgans, many of which have already been explored, and their contents deposited in the Irkutsk museum. Amongst these are great numbers of stone implements, and objects made of bone and mammoth tusks, besides carefully worked copper ware, betraying technical skill and some artistic taste in the designs. In Trans-Baikalia, still farther east, with the kurgans are associated the so-called _Kameni Babi_, "Stone Women," monoliths rough-hewn in the form of human figures. Many of these monoliths bear inscriptions, which, however, appear to be of recent date (mostly Buddhist prayers and formularies), and are not to be confounded with the much older rock inscriptions deciphered by W. Thomsen through the Turki language.