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 A letter from Washington on the letterhead of the U. S. Geological Survey, dated April 11, 1887 and written to E. J. Nolan of the Academy. Marcou discusses the statement made by Sabine, that the Academy's copy of T. A. Conrad's Fossils of the Medial Tertiary of the United States is incomplete. Marcou agrees that Sabine is correct because he has examined one owned by Otto Meyer which has extra information. The additions to the text and titlepage made on the Academy's copy were entered by...