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174 the decomposition of rocks, when their exploitation requires underground work; phosphates which may be used for fertilizers; solid mineral fuels; petroleum and all hydrocarbons—solid, liquid or gaseous.

In the Nation is likewise vested the ownership of the waters of territorial seas to the extent and in the terms fixed by the law of nations; those of lakes and inlets of bays; those of interior lakes of natural formation which are directly connected with flowing waters; those of principal rivers or tributaries from the points at which there is a permanent current of water in their beds to their mouths, whether they flow to the sea or cross two or more States; those of intermittent streams which traverse two or more States in their main body; the waters of rivers, streams, or ravines, when they bound the national territory or that of the States; waters extracted from mines; and the beds and banks of the lakes and streams herein-before mentioned, to the extent fixed by law. Any other stream of water not comprised within the foregoing enumeration shall be considered as an. integral part of the private property through which it flows; but the development of the waters when they pass from one landed property to another shall be considered of public utility and shall be subject to the provisions prescribed by the States.

In the cases to which the two foregoing paragraphs refer, the ownership of the Nation is