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(who founded , and for fifty years directed, the prehistoric museums at Copenhagen) published his first memoir of his discovery of the prehistoric civilizations which he called after the material principally employed for cutting implements, and named them, "The Ages of Stone, Bronze, and Iron," which names have been ever since universally recognized.

  In 1853 Dr. Ferdinand Keller discovered at Meilen in Lake Zurich, Switzerland, certain evidences which developed into our present knowledge of the Swiss Lake-dwellers, although it has been since discovered that the lake-dwellers extended to many other countries of Europe.

  Beginning with 1836, M. Boucher de Perthes, residing at Abbeville on the river Somme, had discovered certain flint implements rudely chipped, of the form of an almond or peach stone with the cutting edge at the point. He had found them deep in the gravelly terraces of the river Somme, and in such position and association as that he