Scope and Contents Although most of these treatises appeared in the Academy's early serials, some predated that time. A list of the articles by some 81 naturalists has been prepared and is available for reference. The papers themselves deal with all sorts of natural history subjects, some of the more prolific authors being: Spencer F. Baird, John Cassin, Charles Girard, Gerard Troost, Lardner Vanuxem, and S. W. Woodhouse. These writings are preserved with the intention of providing research workers with...

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...