"This fine work was executed for Mr. Corcoran at the particular request of Humboldt. Rauch was one of the most eminent sculptors of his time. His greatest work is the statue of Frederick the Great, at Berlin." [P. 3.]
Catalogue of the Paintings, Statuary, Casts, Bronzes, &c. of the Corcoran Gallery of Art. Washington, D.C. Gibson Brothers, Printers, 1874.