Reverend Francis Augustus Brown was a Presbyterian missionary assigned to Xuzhou during the Yellow River flood. The men wearing swastikas are from the Red Swastika Society, a relief organization. The man in the suit on right is possibly Harrison Forman's interpreter.
Source of Descriptive Information
Challis, D., & Rawlinson, G. (2002). The book of Iris: A life of Robin Hyde. Auckland, N.Z.: Auckland University Press.