John Horton Daniels, a doctor based in Nanjing 南京, China and his wife Helen Daniels, were both missionaries with the Presbyterian General Board of Missions 長老會 and worked for medical missions in Nanjing China. This collection contains correspondence covering the period during which they lived and worked in China, including the final years leading up to the establishment of the People's Republic and the eviction of the missionaries, and John Horton Daniels's internment in the Philippines. This collection also contains clippings and publications related to the Daniels' work in China, as well as the Nanking Massacre of 1937.