In 1835, M. Joly, at that time Professor at the Lyceum of Montpellier--where I (the author) attended on his course of Natural History--now Professor in the Faculty of Sciences at Toulouse, found in the cave of Nabrigas (Lozère) the skull of a cave-bear, on which an arrow had left its evident traces. Close by was a fragment of pottery bearing the imprints of the fingers of the man who moulded it. We may well be surprised that, in the face of all these previous discoveries, Boucher de Perthes, the ardent apostle in proclaiming the high antiquity of our species, should have met with so much opposition and incredulity; or that he should have had to strive against so much indifference, when, beginning with the year 1836, he began to maintain this idea in a series of communications addressed to the Société d'Emulation of Abbeville. The horizontal strata of the quarternary beds, known under the name of _diluvial_, form banks of different shades and material, which place before our eyes in indelible characters the ancient history of our globe. The organic remains which are found in them are those of beings who were witnesses to the diluvial cataclysm, and perhaps preceded it by many ages. "Therefore," says the prophet of Abbeville, "it is in these ruins of the old world, and in the deposits which have become his sole archives, that we must seek out the traditions of primitive man; and in default of coins and inscriptions we must rely on the rough stones which, in all their imperfection, prove the existence of man no less surely than all the glory of a Louvre." Strong in this conviction, M. Boucher de Perthes devoted himself ardently to the search in the diluvial beds, either for the bony relics of man, or, at all events, for the material indications of his primitive industry. In the year 1838 he had the honour of submitting to the Société d'Emulation, at Abbeville, his first specimens of the antediluvian hatchet. In the course of the year 1839, Boucher de Perthes took these hatchets to Paris and showed them to several members of the Institute. MM. Alexandre Brongniart, Flourens, Elie de Beaumont, Cordier, and Jomard, gave at first some encouragement to researches which promised to be so fruitful in results; but this favourable feeling was not destined to last long.