The Constitution, in Article I, Section X, forbids the States to "emit bills of credit, make anything but gold and silver a legal tender in payment of debts, pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts." Until 1798, the provision generally regarded as offering the most promising weapon against special legislation was the ex post facto clause. In that year, however, in its decision in Calder vs. Bull the Court held that this clause "was not inserted to secure the citizen in his private rights of either property or contracts," but only against certain kinds of penal legislation. The decision roused sharp criticism and the judges themselves seemed fairly to repent of it even in handing it down. Justice Chase, indeed, even went so far as to suggest, as a sort of stop-gap to the breach they were thus creating in the Constitution, the idea that, even in the absence of written constitutional restrictions, the Social Compact as well as "the principles of our free republican governments" afforded judicially enforcible limitations upon legislative power in favor of private rights. Then, in the years immediately following, several state courts, building upon this dictum, had definitely announced their intention of treating as void all legislation which they found unduly to disturb vested rights, especially if it was confined in its operation to specified parties. ¹ ¹ In connection with this paragraph, see the writer's article entitled The Basic Doctrine of American Constitutional Law, in the Michigan Law Review, February, 1914. Marshall once wrote Story regarding his attitude toward Section X in 1787, as follows: "The questions which were perpetually recurring in the State legislatures and which brought annually into doubt principles which I thought most sacred, which proved that everything was afloat, and that we had no safe anchorage ground, gave a high value in my estimation to that article of the Constitution which imposes restrictions on the States." Discourse.