Question:
Which employer did Hermann Ebbinghaus work for in Apr, 1904?

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

Answer:
University of Wrocław