Scope and Contents The Hayden Award consists of a medal and honorarium, which under the deed of gift are presented once every three years as a reward for the best publication, exploration, discovery or research in the sciences of geology or paleontology. Mrs. Emma W. Hayden set up the fund in 1888 as a memorial to her husband, Ferdinand Vandever Hayden, who had been director of the U.S. Geological Survey and a member of the Academy. The collection contains historical items, biographies of recipients,...

Scope and Contents

These letters written to John Lawrence LeConte by 101 authors are for the most part taken from the files of the American Entomological Society, but include also 18 written by T. W. Harris to John LeConte. The collection was archived from the Entomological Department and here preserved under LeConte's name.

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...