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Correspondence from John Howard Redfield to John Torrey, dated 1850-1872, discussing his botanical activities, particularly his work with ferns. Obsolete and unresolved plant names mentioned include Linosyris, Polystichum aculeatum x braunii, and Sarracenia drummondii.
Correspondence from Joseph Drayton to John Torrey, dated 1847 and 1850. Two brief notes, both written on behalf of William Brackenridge, regarding the work both Daryton and Brackenridge were doing on the report on the United States Exploring Expedition. In the first note, dated December 18, 1847, Drayton says Brackenridge needs some botanical reference books and asks Torrey to ship them to Philadelphia; in the second, dated July 22, 1850, he announces he will be bringing Torrey page proofs from Brackenridge and sample plates (presumably his own work) up from Philadelphia the following day by train.