Relating to the interior) comprised within boundary lines; of interior concern or Interest; domestic, as opposed to foreign. Internal commerce. See COMMERCE. Internal improvements. With reference to governmental policy and constitutional provisions restricting taxation or the contracting of public debts, this term means works of general public utility or advantage, designed to promote facility of intercommunication, trade, and commerce, the transportation of persons and property, or the development of the natural resources 6f the state, such as railroads, public highways, turnpikes, and canals, bridges, the improvement of rivers and harbors, systems of artificial irrigation, and the improvement of water powers; but it does not include the building and maintenance of state institutions. See Guernsey v. Burlington, 11 Fed. Cas. 99; Rippe v. Becker, 56 Minn. 100, 57 N. W. 331, 22 L. R. A. 857; State v. Froehlich, 115 Wis. 32, 91 N. W. 115, 58 L. R. A. 757, 95 Am. St. Rep. 894 ; U. S. v. Dodge County, 110 U. S. 156, 3 Sup. Ct. 590, 28 L. Ed. 103; In re Senate Resolution, 12 Colo. 285, 21 Pac. 483; Savannah v. Kelly, 108 U. S. 184, 2 Sup. Ct. 468, 27 L. Ed. 696; Blair v. Cuming County, 111 U. S. 363, 4 Sup. Ct. 449. 28 L. Ed. 457. Internal police. A term sometimes applied to the police flower, or power to enact laws in the interest of the public safety, health, and morality, which is inherent in the legislative authority of each state, is to be exercised with reference only to its domestic affairs and its own citizens, and is not surrendered to the federal government. See Cheboygan Lumber Co. v. Delta Transp. Co., 100 Mich. 16, 58 N. W. 630. Internal revenue. In the legislation and fiscal administration of the United States, revenue raised by the imposition of taxes and excises on domestic products or manufactures, and on domestic business and occupations, inheritance taxes, and stamp taxes; as broadly distinguished from “customs duties,” t. e., duties or taxes on foreign commerce or on goods imported. See Rev. St. U. S. tit. 35 (U. S. Comp. St. 1901, p. 2038). Internal waters. Such as lie wholly within the body of the particular state or country. The Garden City (D. C.) 26 Fed. 773.