Book Reviews : The Education of Historians in the United States. By DEXTER PERKINS, Chair man, JOHN SNELL, Director, and Committee on Graduate Education of the American Historical Association: Jacques Barzun, Fred Harvey Harrington, Edward C. Kirkland, Leonard Krieger, and Boyd C. Shafer. (New York: McGraw-Hill Book Co., Inc., 1962. Pp. xiii, 244. $4.95.)