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Here again our author seems to me to refute his own supposition, That a chasm in the schistus rock may have existed at the bottom of the sea, and been then filled from above with such materials as were transported by the moving water to that place, is not impossible; but nobody, who knows the nature of a common metallic vein, can ever suppose it to have been filled in that manner. Our author then adds, "On ne fait réellement que commencer dans ce genre d'observations, considérées quant

On verra dans le IVe. volume comment douze ou treize ans d'observations et de réflections continuelles sur ce même sujet auront modifié ce premier germe de mes conjectures; je n'en parle ici qu'historiquement, et pour faire voir qu'elles sont les premières idées que le grande spectacle du Cramont doit naturellement faire éclore dans une tête qui n'a encore épousé aucun système

The following table contains the results of an attempt which I made, conjointly with M. Mathieu, member of the Academy of Sciences, and of the Bureau des Longitudes, to estimate with precision the extent of the surface of the various states of America. We made use of maps on which the limits had been corrected according to the statements published in my Recueil d'Observations Astronomiques.

III. Recueil d'Observations Astronomiques, et de Mésures exécutées dans le Nouveau Continent: two volumes quarto.