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220 De Rebus Gestis Pollicilli. Their energies remain unimpaired; and although mine are gradually failing me, I enjoy the consolation of having spent them in pursuing incessantly one object, and fruitlessly.

So far as my boots would carry me, I have observed and studied our globe and its conformation, its mountains and temperature, the atmosphere in its various changes, the influences of the magnetic power; in fact, I have studied all living creation—and more especially the kingdom of plants—more profoundly than any one of our race. I have arranged all the facts in proper order, to the best of my ability, in different works. The consequences deducible from these facts, and my views respecting them, I have hastily recorded in some essays and dissertations. I have settled the geography of the interior of Africa and the Arctic regions, of the interior of Asia and of its eastern coast. My Historia Stirpium Plantarum Utriusque Orbis is an extensive fragment of a Flora universalis terræ and a part of my Systema Naturæ. Besides increasing the number of our known species by more than a third, I have also contributed somewhat to the natural system of plants and to a knowledge of their geography. I am now deeply engaged on my Fauna, and shall take care to have my manuscripts sent to the University of Berlin before my decease.