Autograph Letter Signed ‘W.Sonder’, to Filippo Parlatore, asking him to help Sonder’s friend C.Schuder to see the most important works of art in Florence. In French. 1 page 9 x 6 inches, fine. Hamburg, 7 June 1857. Otto Wilhelm Sonder (1812-1881), German botanist and pharmacist. Sonder kept a very extensive botanical collection, containing hundreds of thousands of specimens. After it grew too large for him to manage on his own, he sold it to his friend Ferdinand von Mueller, who sold parts of it to the Swedish Museum of Natural History and to Jean Michel Gandoger, with the bulk of the collection, about 250–300,000 specimens, going to the Melbourne Royal Botanic Gardens. He was co-author, with William Henry Harvey (1811–1866), of Flora Capensis.