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...

Scope and Contents The Witmer Stone papers document Stone’s research and his expansive network of scientific colleagues. This collection is arranged into four series: “I. Correspondence,” “II. Professional organizations,” “III. Graphic materials,” and “IV. Writings and notes.Series “I. Correspondence” is arranged alphabetically, and contains letters between Stone and other ornithologists regarding bird species, article submissions for The Auk, and other related...