The Great Naturalist.—Baron de Humboldt has addressed the following note to the Berlin journals:—“Overwhelmed by the number of letters sent me, and which are increasing every day, amounting to from 1600 to 2000 per annum—many, too, being on the most futile subjects, such as demands for my autograph, and offers to cure me of all diseases—I once more make a public appeal to the persons who wish me well, and request them not to occupy themselves so much with what concerns me, in order that with the diminution of strength, physical and intellectual, which I experience, I may be allowed a little leasure for study and composition.

I trust that this step, to which I have recourse with reluctance, will not be interpreted unkindly.”