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Rh by Sotacus, and preserved by Pliny, of which mention has already been made, there can be but little doubt of the term referring either to stone hatchets, worked flints, or arrow-heads, of some such kind as those still known as thunderbolts; and therefore that when Claudian, early in the fifth century, wrote

he must have had in his mind some account of the occurrence of such objects in that district, where so many discoveries of this character have since been made.

The researches of MM. Tournal, de Christol, and Marcel de Serres, now some sixty or seventy years ago, by which the coexistence of man with many of the extinct mammals was rendered probable, if, indeed, not actually proved, were directed to caverns which, though not in the immediate neighbourhood of the Pyrenees, were still in the South of France. These researches are well known to geologists, but the most important discoveries are those made in more modern times, in caverns principally in the Dordogne and other departments of the ancient Province of Aquitaine, by the late Prof. E. Lartet and Mr. Henry Christy, as well as by M. Alphonse Milne-Edwards, the Marquis de Vibraye, MM. Garrigou, Rames, Brun, Cazalis de Fondouce, Ferry, Gervais, Cartailhac, Piette, Boule, Massénat, Chantre, and numerous other active investigators.

The discoveries made by Dr. Schmerling in the caves of Belgium, an account of which he published in 1833, showed that human bones, as well as worked flints, and bone instruments were associated with the remains of extinct animals in several instances; and, though not gaining general acceptance at the time, have since been fully borne out by the investigations so ably conducted by Dr. E. Dupont.

The late Prof. E. Lartet some years ago suggested a classification of the different divisions of Time represented in the French caves containing traces of man associated with various animal bones, under successive heads, as the Ages of the Cave-bear, the Mammoth, the Reindeer, and the Bison, in accordance with the comparative abundance of the remains of each of these animals in