Photographer unknown2018-09-252018-09-251938http://172.16.52.76:80/cdm/ref/collection/coll3/id/269https://hdl.handle.net/20.500.12111/4241According to Louise Morse, Mrs. Wallser was Euler's grand-niece and had a ring given to him by Catherine the Great.SepiaPermission to use this image must be requested from the Institute's Archives. Please contact archives@ias.edu.Image