Six handwritten pages from a daybook, ten letters from Cornelius' children to their parents and to each other, and three medical prescriptions. The daybook may be an account record of Cornelius' patients. The letters are personal and chiefly concern religious matters and health. Most were written by Cornelius' son, the Rev. Elias Cornelius, a Presbyterian missionary, and describe his studies, preaching, the progress of his ministerial work, and frequent concern for the spiritual welfare of others.