By 1924, Dr Bierens de Haan had decided that the Boijmans Museum would be in charge of his collection after his death, partly because the museum had purchased the Domela Nieuwenhuis print collection. In other respects too, he was closely involved with the museum. Between 1939 and 1951, for instance, he was on the board of the Boijmans Museum, he regularly donated items from his collection to the museum and was liberal in lending out items for special exhibitions. His legacy was not only of invaluable interest because of its magnitude, but – more importantly – because of its quality. Funds from his legacy still help the museum to continue adding to its print collection.