Scope and Contents Introductory statement: "In becoming a member of the Academy of Natural Sciences of Philadelphia, I promise to conform myself to its constitution, laws and regulations, and in testimony of this declaraction, I do hereunto subscribe my name." The first page is signed by Wm. Maclure, Zaccheus Collins, George Ord, Reuben Haines, Edward Barton, John Barnes, Thomas Say, LeSueur, Isaiah Lukens, T. Peale, Jacob Peirce, J. Gilliams, and Benjamin Say. The first 51 pages have no dates or code...

Overview Joseph Mellick Leidy (1823-1891), one of the great American scientists of the 19th century, possessed a vast knowledge of the natural world. Best known as the Father of American vertebrate paleontology, he also pioneered the fields of parasitology and protozoology, and was the preeminent anatomist of his time. He was also an influential teacher of natural history and an expert in areas as diverse as entomology, geology and pathology. The Joseph Leidy Correspondence collection contains...