Correspondence and research notes compiled by Dr. Castle in his efforts to create a complete record of persons who served in the U.S. Army Medical Department's Medical Cadet Corps during the Civil War.

General medical history, also containing case reports for John Stanton, Tobias Duell, Henry Fay, Henry Thorncroft, Baylor H. Thinell and Marvin Garrison, all of whom died by disease in October 1862 at general hospital no. 6 in Nashville, or general hospital no. 14.