The learned Geologist of Montpelier, M. Marcel de Serres, has just communicated to the Paris Academy of Sciences the following facts concerning the dunes, or shifting sand-hills, of the French Mediterranean coasts. These sands are first thrown upon the shore by the sea; when dry, they are carried inward by the winds, to the distance of several kilométres, covering fields and vineyards to the depth of two or three feet, suffocating vegetation, and transforming the richest cultivation into a desert waste.