Yes, he does say something about American society, which so frowned on miscegenation in the 1870s.
The miscegenation Ball was an exception in its otherwise bland, though proficient, catalog.
miscegenation would follow and a mongrel race would be the result.
miscegenation mis·ceg·e·na·tion (mĭ-sěj'ə-nā'shən, mĭs'ĭ-jə-)
Marriage or sexual relations between individuals of different races.