=Federal Pure Food Legislation.=--The commerce clause of the Constitution is also the source of some important legislation designed to protect the public against impure, unwholesome, and adulterated foods produced in the United States. We have already called attention to the legislation of Congress against the importation of impure foods, and teas from abroad. Still more recently Congress passed an interstate pure food law prohibiting the transportation among the states and territories of any food products which are adulterated or which contain foreign substances not indicated in the labels. The law also provides for the fixing of a standard of pure foods and other products transported from one state to another or intended for interstate transportation, and provides that they must come up to the standard prescribed. _The Meat Inspection Law._--To protect the public against unwholesome meat products, Congress enacted in 1891 a law which was strengthened in important particulars in 1906, providing for the inspection of slaughtering houses whose products are intended for interstate commerce. The law requires the registration of all establishments engaged in slaughtering animals the products of which are to be shipped into other states or are intended for export. Each is given a number, and federal inspectors are assigned to inspect the animals intended for slaughter, to inspect their carcasses in certain cases, and to see that the business of slaughtering is conducted under clean and wholesome conditions. Animals found suffering with certain diseases are not allowed to be slaughtered for food purposes, and meat discovered to be unwholesome must be rejected. Supervision is also exercised over the processes of packing and canning, and there are detailed regulations in regard to labeling. =References.= ANDREWS, Manual of the Constitution, pp. 89-95. BEARD, American Government, ch. xix. COOLEY, Principles of Constitutional Law, pp. 66-88. HART, Actual Government, ch. xxiv. HINSDALE, American Government, secs. 374-380. JOHNSON, Railway Transportation, ch. xxvi. =Illustrative Material.=--Annual reports of the Interstate Commerce Commission, of the Department of Agriculture, of the Attorney-General, of the Commissioner of Navigation, of the Commissioner of Immigration, and of the Public Health and Marine Hospital Service. RESEARCH QUESTIONS 1. What were the reasons for giving Congress control over foreign and interstate commerce? 2. Why did the delegates from the Southern states oppose giving this power to Congress? 3. What is meant by the "original package" doctrine? 4. Why should a railroad company be prohibited from granting rebates? For charging more for a "short haul" than for a "long haul"? From transporting the products of its own mines and manufactories? From pooling its freight or earnings?