Provost Buck yesterday announced the promotion of five assistant professors to the rank of associate professor.

Only the promotion of Andrew M. Gleason, present assistant professor of Mathematics, will take effect this year. He becomes associate professor July 1, 1953. The four other promotions will not be effective until the expiration of the present appointments on July 1, 1954.

The four other professors are: I. Bernard Cohen '37, appointed associate professor of General Education and of the History of Science, Richard N. Frye, appointed associate professor of Middle Eastern Studies, Daniel H. H. Ingalls '36, appointed associate professor of Sanskrit and Indian Studies, and Horace G. Lunt II '41, appointed associate professor of Slavic Languages and Literatures.

Gleason Won Cleveland Prize

Gleason, a Yale graduate of the Class of 1942, recently received the Newcomb Cleveland Prize of the American Association for the Advancement of Science for his contribution to the solution of "Hilbert's Fifth Problem." The problem has been important in mathematical theory for 50 years.

Cohen has edited the scholarly journal "Isis" while teaching the nature and growth of scientific concepts to non-scientists in the General Education program.

Nelson is a specialist on the Middle East, ingalls an expert in Indian Literature, and Lunt an authority on Slavic Philology and Russian.