(From the N. Y. Tribune.)

BARON HUMBOLDT ON AMERICAN SLAVERY. A PRIVATE LETTER TO J. FROEBEL.

Accept, my dear Froebel, if only a few lines, my most cordial thanks for your kind letter and for the gift of an able work on your personal experiences in America, in which you have submitted all classes of society to such a sagacious comparison.

Continue to brand the shameful devotion to slavery, the treacherous importation of negroes under pretence of their becoming free—a means to stimulate the hunting of negroes in the interior of Africa.

What atrocities have been witnessed by one who has had the misfortune to live from 1789 to 1858!

My book against slavery (Political Essay on the Island of Cuba) is not prohibited in Madrid, but cannot be purchased in the United States, which you call “the republic of distinguished people,” except with the omission of everything that relates to the sufferings of our colored fellow-men, who, according to my political views, are entitled to the enjoyment of the same freedom with ourselves.

Add to this, the anathema on other races of men, forgetting that the most ancient cultivation of humanity, before that of the white Hellenic race, in Assyria, in Babylon, in the valley of the Nile, in Iran, in China, was the work of colored men, though not woolly haired.

With renewed expressions of the friendship of many years, which political events have never troubled,

I am ever your illegible Al. Humboldt.

Berlin, January 11, 1858.