In this notice we commence the first of a series of articles descriptive of the geological diagrams, of which last month we commenced the issue. The notoriety which the discovery of flint implements of human manufacture of Amiens and Abbeville by M. Boucher de Perthes has attained, and the amount of research and investigation now going on renders it necessary for us to lay before our readers the chief points of the proofs of the human workmanship of those articles.