WJ. Brazil diary, showing portrait of Louis Agassiz. Pencil on paper,  Museum of Comparative Zoology Archives, bMu 1556.41.1. Ernst Mayr Library of the MCZ, Harvard University.
“From his boyhood he looked on the world as if it and he were made for each other, and on the vast diversity of living things as if he were there with authority to take mental possession of them all.”-- “Louis Agassiz” (1896)