This was published as An Essay on the Physiology of Mind (Philadelphia: Saunders, 1922). There is also an accompanying manuscript version in French, "Physiologie de la pensée" (167 pages).

This is a biographical sketch of Dercum, who was a specialist in neurology and president of the American Philosophical Society (1927-1981). Dercum practiced medicine in Philadelphia and made the first contribution to understanding adiposis dolorosa, or Dercum's disease. This essay was presented before the Section on Nervous and Mental Diseases of the American Medical Association, in Cleaveland, June 4, 1941.

Founded in 1743 by Benjamin Franklin, the American Philosophical Society was the first learned society in the United States. For over 250 years, the Society has played an important role in American cultural and intellectual life. Until the mid-nineteenth century, the Society fulfilled the role of a national academy of science, national library and museum, and even patent office. Early members of the Society included Thomas Jefferson, David Rittenhouse, Benjamin Rush, Stephen Peter Du Ponceau, George Washington, and many other figures prominent in American history. The Archives of the American Philosophical Society consists of 192.25 linear feet of material, organized into thirteen record groups dating back to 1743. The Society's archives extensively documents not only the organization's historical development but also its role in American history and the history of science and technology.

An electrical engineer, inventor, and entrepreneur, Elihu Thomson was an innovator in electrification in both a technical and corporate sense. With interests that ranged from the technical (electrical meters, high-pressure steam engines, dynamos, generators) to scientific (fused quartz optics, X-rays), Thomson acquired over 700 patents in his career, and in 1882, founded one of the early electrical corporations in the United States, the Thomson-Houston Company, which merged with the Edison Electric Company in 1892 to form the General Electric Company. The Thomson Papers are a massive and nearly comprehensive collection documenting the wide range of Thomson's scientific and technical interestsm from his electrical experiments, inventions, and patents, to his interests in astronomy, geology, and medicine, as well as his role in the development of two major corporations involved in electrification, the Thomson-Houston Electric Company and General Electric Company. Roughly three quarters of the collection is dated between 1890 and 1920 when Thomson was associated with General Electric, and was active in professional groups such as the American Institute of Electrical Engineers (AIEE), International Electrotechnical Commission. His research interests. The balance of the collection is comprised of eight boxes and five volumes relating to Thomson's patents; a series of notebooks kept at Central High School; 43 letterbooks, 1882-1936; diaries of trips to Europe; notebooks on genealogy; scrapbooks of cards, photographs, clippings, and other souvenirs; and 2 vols. of tributes on his eightieth birthday, etc.