A new associate professor and two visiting professors will fill gaps in the Philosophy department next fall caused by a retirement and there temporary leaves of absence, it was learned yesterday.

Retiring next year is Clarence I. Lewis '06, Edgar Pierce Professor of Philosophy, who has been on the faculty since 1921. Lewis is 69.

The new associate professor is Professor Roderick Firth of Swarthmore College. A graduate of Haverford College, Firth received his M.A. here in 1940 and his Ph.D. in 1943. His field is Epistomology--The Theory of Knowledge.

Quine to Teach at Oxford

Two visiting professors, as yet unnamed, will fill in temporarily for three of the faculty on leaves of absence. Morton G. White, associate professor of Philosophy, will spend next year at the Institute for Advanced Study at Princeton. William V. O. Quine, professor of Philosophy and head of the department, has been named Eastman Visiting Professor at Oxford next year.

The third leave began this term, when Henry D. Aiken, associate professor of Philosophy, began a year as visiting professor at the University of Michigan. He will be back for the spring term next year.