Subject: Paleontology

This is an offprint of a monograph by Jacob Green describing two new species of trilobites. The monograph is dated January 24, 1837, and is an offprint of a speech delivered that day at the Academy of Natural Sciences in Philadelphia. This particular copy is inscribed to Dr. J. J. Cohen by the author. Jacob Green was a prominent scientist who held professorships in chemistry and natural history at Princeton and Jefferson Medical College. He was a prolific publisher on trilobites and other scientific topics.

Book published in 1833 describing the inferior maxillary bones of mastodons. Authored by Isaac Hays, this work discusses fossil vertebrate specimens and their relevance to evolutionary theories. Hays's work includes descriptions of fossil specimens and their relevance to the ongoing debate regarding the theory of evolution. The book also touches upon Hays's contributions to paleontology, his involvement in naming disputes with other scientists, and his collaborations with other individuals like Isaac Lea. Hays's arguments for the validity of Tetracaulodon as a distinct species in relation to Harlan's theory are also explored.

Three and three-quarters page letter written on Academy of Natural Sciences stationary by Angelo Heilprin to C. B. Norton on March 23, 1884. Heilprin, curator at the Academy of Natural Sciences in Philadelphia, offers observations and advice to Norton concerning a proposed exhibition of American art in London. The letter reflects the state of American art relative to European art during that period.

A one-page stampless letter dated December 11, 1838, from Dr. Jacob Green in Philadelphia, Pennsylvania, to Dr. J. J. Cohen in Baltimore, Maryland. Green, Professor of Chemistry at Jefferson Medical College, thanks Cohen for sending fossils he examined.

First edition of Volume III, New Series, of the Transactions of the American Philosophical Society, published in 1830. This volume notably includes John Davidson Godman's article, "Description of a New Genus and New Species of Extinct Mammiferous Quadruped," a significant early work in American paleontology that, although incorrect in its conclusions, sparked considerable debate. The volume also features Isaac Hays's contribution, "Description of a fragment of the Head of a New Fossil Animal discovered in a Marl Pit, near Moorestown, N.J.," which weighs in on Godman's findings. The book's importance lies in its documentation of a pivotal moment in the development of American paleontology, showcasing early attempts at classifying fossil remains and the subsequent discussions among prominent scientists of the era. The volume is beautifully illustrated with engraved plates.