Of the three thousand PhD's in physics listed inAmerican Men of Science, more than sixty percent received their doctorates from thirteen leading institutions, according to a survey of the graduate school origins of physicists prepared by John N. Cooper of the Ohio State University and published in the November 1952 issue of theAmerican Journal of Physics. The University of Chicago heads the list with a total of 230 awards. Expanded graduate school programs at a number of other institutions, however, may be expected within a decade or so to swell the list of major producers of PhD's in physics, Dr. Cooper says.