But as long as State Legislatures are required to prescribe regulations which require personal agents or officials to carry them into effect. the power of the State is complete over such regulations and over the agents or officers who execute them. It is an axiom in natural philosophy that "two substances cannot occupy the same place at the same time." It is eqnally axiomatic that two legislative jurisdictions cannot take effect upon the same subjectmatter and the same persons at the same time. Two courts may have jurisdiction of the same subjectmatter and the same parties. but cannot exercise it at the same time: as. for instance. a State court has jurisdiction to naturalize foreignborn persons. to try suits in which a citizen of one State is plaintiff and a citizen of another is defendant. and to try persons for counterfeiting the money of the United States. A United States court in the same district has also jurisdiction of. such cases. but both courts cannot try the same case at the same time. While the State court is exercising the jurisdiction. the Federal court and the Federal Government and all its agents and officials must refrain from any supervision. scrutiny. or interfererice whatever with the proceedings. and vice versa.
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naturalize