The Commerce Power versus States Rights. By Edward S. Corwin. (Princeton: University Press. 1936. Pp. xiv, 276. $2.50.) The Commerce Clause under Marshall, Taney, and Waite. By Felix Frankfurter. (Chapel Hill: University of North Carolina Press. 1937. Pp. 114. $ 1.00.) The Supreme Court and Political Questions. By Charles Gordon Post, Jr. [The Johns Hopkins University Studies in Historical and Political Science.] (Baltimore: Johns Hopkins Press. 1936. Pp. 145. $1.25.)