Letter from Dr. Henderson to his brother, Daniel C. Henderson, on crop yields, medicinal plants, and the symptoms of a local fever; letter to Dr. H.H. Sherwood of Watertown, New York announcing Henderson's marriage; fragment of a letter to his brother [1816?] about the engineering difficulties involved in building a proposed canal from Lake Erie to Albany, New York; and fragmentary postage accounts. Also, a centennial publication HISTORIC WILLOUGHBY (Ohio).