By Michael J. Sandel, Farrar, Straus & Giroux, New York, N.Y. 308 pages, $25.00

Harvard students crowd the auditorium where Professor Michael J. Sandel delivers his lectures on political philosophy. Small wonder, then, that his latest book, a treatise on public morality, has made best-seller lists. Its subject matter, presented with depth of thought and clarity of expression, gives “Justice” a special appeal for lawyers.