He was educated at the Universities of Breslau and Berlin, and at the latter city saw, through the Mendelssohns, a good deal of the best literary society there, and made the acquaintance, among others, of Alexander von Humboldt, who used to call him a wunderkind.
"Contemporary Socialism"
John Rae
Humboldt called him "wunderkind."
"A Biographical Dictionary of Freethinkers of All Ages and Nations"
Joseph Mazzini Wheeler
She is a wunderkind.
"In the Courts of Memory 1858-1875."
L. de Hegermann-Lindencrone