For over fifty years this book has been a basic resource in the study of U.S. Constitutional Law. Frequently updated, it has kept pace with current interpretations of the Constitution, primarily as reflected in decisions by the Supreme Court. The 13th edition, the first new edition since 1958, retains the incisive flavor and commentary of the late Professor Corwin and extends the scope of the book through the 1971-1972 session of the Supreme Court, including the after-session decision on the seating of delegates at the 1972 Democratic Convention.