Correspondence, writings, and other papers, chiefly of scientists, relaitng to scientific topics, including chemistry, physics, geology, genetics, medicine, obstetrics, anthrolopogy, astronomy, natural history, and scientific instruments. Includes minute book (1862-1896) of the Linnaean Society of Lancaster County, Pa., list (1854) of observers and correspondents of the Smithsonian Institution with their specialties, bibliography of fundamental American scientific research during the 19th century by Phyllis Allen Richmond, and material on Charles Darwin and Thomas Godfrey. Names represented include: John Lubbock, Baron Avebury, James Bryce, William Buckland, William Ernest Castle, Edward Waller Claypole, Sir Francis Galton Darwin, Jean Baptiste Andr Dumas, George William Featherstonhaug, John Fothergill, Hieronymus David Gaubius, Benjamin Heiberg, Heinrich Gustav Johannes Kayser, Ren LaRoche, Margaret Mead, Etienne Mignot de Montigny, John Morgan, Thomas Hunt Morgan, Alfred Newton Richards, Henry A. Rowland, Joao de Souza Palher, Nathan Spencer, and Henry and Thomas Voight.