IMPLEMENTS.

   General Position of Drift with extinct Mammalia in Valleys.
   Discoveries of M. Boucher de Perthes at Abbeville.
   Flint Implements found also at St. Acheul, near Amiens.
   Curiosity awakened by the systematic Exploration of the Brixham Cave.
   Flint Knives in same, with Bones of extinct Mammalia.
   Superposition of Deposits in the Cave.
   Visits of English and French Geologists to Abbeville and Amiens.