The Saturday Evening Post has assembled another illustrious collection of essays by the alert and informed thinkers of our time. The Post's purpose is to bridge the gap between the intellectual and the intelligent layman, to broach such unwieldy problems as the population expansion, the crisis in education, and to inform the reader of advances in a wide variety of fields. The Series has an austere and high-level intent; as a result the editors succeed admirably. Such sticky subjects as mathematics and economics gather dew and sparkle when described by Morris Klein or the New Frontier economist, John Kenneth Galbraith. There is a delightful satire by C. S. Lewis, Screwtape Prepares a Toast and a study of Life's Mysterious Clocks which includes such familiar organisms as flies and fiddler crabs. There is Francois Mauriac's discussion of Anguish, a reassessment of Existentialism by Wm. Barnett, and the Natural History of a Star. Reading an essay every night for about five weeks will give a hungry mind enough to chew and digest for months to come. As if to prod the new appetite there is a short bibliography for further reading at the end of each essay.