The Radcliffe chapter of Phi Beta Kappa last night awarded the prize for the best non-technical essay on a scientific subject to Mary S. McGuire '56, an English major.

Her essay, dealing with the probable limits of our knowledge of the universe, was selected by a committee of Harvard faculty members from the humanities and natural sciences departments.

At the same meeting, the chapter awarded a $50 prize to Marina von Neumann '56 as the holder of the highest scholastic average in her class. Miss von Neumann was a junior Phi Bete, editor of the "Radcliffe News," and is currently undergraduate secretary of the chapter.