Question:
Where was Dirk Jan Struik educated in Sep, 1924?

Context:
 Dirk Jan Struik attended Leiden University from Jan, 1912 to Jan, 1917. 
 Dirk Jan Struik attended Sapienza University of Rome from Jan, 1924 to Jan, 1925. 
 Dirk Jan Struik attended University of Göttingen from Jan, 1925 to Jan, 1926.

Answer:
Sapienza University of Rome