Mardi (nous nous étions rencontrés ce jour là) à l’homme du Dimanche: et tant de choses, cependant, qui me restaient à faire! trois ouvrages importans à mettre au jour, les matériaux préparés, tout était disposé dans ma tête, il ne me restait plus qu’à écrire._” “You see how it is, how different the man of Tuesday (we had met on that day) from the man of Sunday: and so many things too that remained for me to do! three important works to bring out, the materials prepared, all disposed in order in my head, I had nothing left to do but to write.” In four hours afterwards that wonderfully organized head had become a mere mass of insensible matter. Besides the works above enumerated, and many memoirs in the transactions of the scientific bodies of Paris, he has given to the world, in four octavo volumes, a History of the Progress of the Physical Sciences, from 1789 to 1827, which evince his genius and extensive erudition. The first volume is a reprint of a report which he presented, as Perpetual Secretary of the Institute, to Napoleon, in 1808, on the Progress of the Physical Sciences from 1789 to 1807. In the same capacity, during thirty-two years, he pronounced the customary Eloges upon deceased members of the Institute. These are collected in three octavo volumes, and bear witness to the versatility of his genius and the extent of his attainments; for whether he is recording the merits of a mathematician, a chemist, a botanist, a geologist, or the cultivator of any other department of science, he shows himself equally conversant with his subject.