Circular letter, sent to Benjamin Smith Barton on May 18, 1809, requesting the receiver to communicate the results of their natural history observations to the society. Indicates that the society is especially interested in specimens of plants and minerals. Autograph signatures of Sam[uel] Hazard, Sam[uel] Belton, and Sam[ue]l Colhoun, members of the correspondence committee of the Philadelphia Linnean Society.
