Fig. 4From: Lost and found: the posthumous portrait of Louis Agassiz by Henry Ulke (1876), and their noteworthy relationshipLetter of condolence upon Louis Agassiz’s death, addressed to his son Alexander Agassiz, by Ulke (1873); and portrait depicting Henry Ulke at respectable age (oil on canvas), not signed, nor dated; courtesy of MCZ Archives, Ernst Mayr Library, Harvard University (bAg 15.30.3-126), and Auktionshaus David (sale of May 12, 2018, lot 76), respectivelyBack to article page