A memorial service for Robert Polson, emeritus professor of rural sociology, who died July 4 will be held Oct. 12 at 3 p.m. in the First Congregational Church, 309 Highland Road. Professor Polson came to the Department of Rural Sociology in 1931 and chaired the department from 1948 to 1957. In lieu of flowers, memorials may be sent to the Polson-Larson Fund, c/o Professor David Brown, Department of Rural Sociology, Warren Hall, Cornell University, Ithaca, N.Y. 14853-7801.