Question:
Which employer did Hermann Ebbinghaus work for in Jan, 1883?

Context:
 Hermann Ebbinghaus works for University of Wrocław from Jan, 1894 to Jan, 1905. 
 Hermann Ebbinghaus works for University of Halle-Wittenberg from Jan, 1905 to Jan, 1909. 
 Hermann Ebbinghaus works for Frederick William University from Jan, 1880 to Jan, 1894.

Answer:
Frederick William University