It reserves to itself further the right to enact uniform civil and criminal codes and procedure, and to legislate regarding the press, associations, the public health, workmen and their protection, expropriation, socialization, trade, commerce, weights and measures, the issue of paper currency, banks and bourses, mining, insurance, shipping, railways, canals and other internal waterways, theaters and cinematographs. "In so far as there is necessity for uniform regulations," the Reich may legislate concerning the public welfare and for the protection of the public order and security. The Reich reserves further the right to establish basic principles of legislation affecting religious associations, schools, manufacture, real estate, burial and cremation. It can also prescribe the limits and nature of the laws of the lands (states) affecting taxation, in so far as this may be necessary to prevent a reduction of the national income or a prejudicing of the Reich in its commercial relations, double taxation, the imposition of excessive fees which burden traffic, import taxes against the products of other states when such taxes constitute an unfair discrimination, and export premiums. The constitution takes from the states the power to collect customs and excises. The federal government is empowered to exercise a direct control in the various lands over all matters falling under its competence. Not only are all the things enumerated above, and many more, reserved to the Reich, but there is no provision conferring expressly any powers whatever on the lands. Nor is there any provision reserving to the states powers not expressly reserved to the Reich or expressly prohibited to the states. Article 12, the only provision along this line, states merely that "so long and in so far as the Reich makes no use of its law-giving powers, the lands retain the right of legislating. This does not apply to legislation reserved exclusively to the Reich." Article 13 provides that "the law of the Reich takes precedence over the law of the lands." In case of a disagreement between state and federal government as to whether a state law is in conflict with a federal law, an issue can be framed and placed before a federal supreme court. Preuss and some of his supporters wanted a provision expressly conferring upon the Supreme Court at Leipsic such power to rule on the constitutionality of legislation as has been assumed by the United States Supreme Court, but their views did not prevail.