Listing of Muysken's education at the Polytechnic School in Delft (1861-1865) and at the Polytechnic School in Hanover (1865-1867). Comparison between P.J.H. Cuypers director's residence of the Rijksmuseum and the Oud-Wassenaar Castle. The search for a national style is also discussed and views, by E. Gugel and others, on the architectural style of Kasteel Oud-Wassenaar.Illustrations: Images of front facade, south facade, floor plan, rear facade, vestibule, small dining room, ceiling of the small dining room, paneling in the small e/Castle Oud-Wassenaar Wassenaar