This collection contains the papers of Samuel George Morton of Philadelphia, a physician, ethnologist, and professor of anatomy at Pennsylvania Medical College. The papers date from 1832 to 1851, when Morton devoted his research efforts almost exclusively to ethnology and to the collecting of human skulls for comparative studies. The bulk of the papers consist of incoming correspondence, relating to ethnology and other related interests such as anthropology, craniology, paleontology and Egyptology. His collecting efforts in the field of crania resulted in extensive correspondence on the subject, which is also included here. The collection is particularly valuable in illustrating the publication process of Morton's technical publications, as it includes extensive notes, annotations, sketches, research and reviews of his published work. There is also a small grouping of documents related to Morton's son, James St. Clair Morton. The collection is arranged into six series: “Correspondence,” “Notes,” “Pennsylvania Medical College,” “Writings,” and “James St. Clair Morton.”