Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr W. G. Van der Tak; Columbusstraat, 255, The Hague Replies to Dr W. G. Van der Tak's enquiry, informing him that the Royal Society's oil portrait of Henry Oldenburg is by John Van Cleef. Asks if Van der Tak would like to take a photograph of the portrait. 27 July 1927