This collection documents the life and work of Herbert Alfred and Ruth McCandliss Judson, who were Presbyterian missionaries to China, stationed primarily in Lianzhou (Linchow), Guangdong province from 1919 to 1927. Herbert and Ruth were children and siblings of missionaries to China and these papers also shed light on the lives and work of their families, in particular Olivia Kerr McCandliss, mother of Ruth McCandliss Judson. She was the daughter of John G. Kerr, who was well known for establishing a hospital for the insane in China. The men of the McCandliss and Judson families were medical missionaries, the McCandliss family being stationed in Hainan.