We are indebted for the photograph used by the engraver to Dr. Kohl’s successor in the librarianship of the Public Library at Bremen, Dr. Heinrich Bulthaupt. No name ranks higher than Kohl’s in the investigations of our early North American geography. “From my childhood,” he says, “I was highly interested in geographical researches in connection with history.” Having gathered much material on the early cartographical history of America in the archives and libraries of Europe, he came to this country, and receiving an appropriation from Congress to enable him to make copies of his maps for the Government, he undertook that work, the results of which are now in the State Department at Washington. All that he desired to do was not provided for by the order of Congress, and he returned to Europe disappointed in his hopes, but leaving behind him, besides the collections in Washington, a memoir with maps on the discovery of the western coast of America, which is now in the library of the American Antiquarian Society. In Europe he annotated and published at Munich in fac-simile the two oldest general maps of America, those known as Ribero’s and Ferdinando Columbus’s, and a treatise on the history of the Gulf Stream, as well as a condensed popular history of the discovery of America. In 1868 he undertook, what proved to be his chief contribution to American historical geography, his _Discovery of Maine_. He did not feel that he had accomplished all in this that he would; but it still remains the most important essay since Humboldt in that peculiar field. See Charles Deane’s notice of Kohl in _Mass. Hist. Soc. Proc._, Dec. 1878, and the memoir in the _Beilage zur Allgemeinen Zeitung_, Augsburg, July 9, 1879.]