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208 discipline of the National Guard, reserving for the citizens who compose it the right of appointing their respective commanders and officers, and to the States the power of instructing it in conformity with the discipline prescribed by the said regulations.

XVI. To enact laws on citizenship, naturalization, colonization, emigration, immigration and public health of the Republic.

1. The Public Health Service shall depend directly upon the President of the Republic, without the intervention of any executive department, and its general provisions shall be binding throughout the Republic.

2. In the event of epidemics of a grave or dangerous nature, of the invasion of diseases from abroad, the Public Health Service shall put into force without delay the necessary preventive measures, subject to their subsequent sanction by the President of the Republic.

3. The sanitary authorities shall have executive faculties and their determinations shall be obeyed by the administrative authorities of the country.

4. All measures which the Public Health Service shall have put into effect in its campaign against alcoholism and the sale of substances injurious to man and tending to degenerate the race shall be subsequently revised by the Congress, in such cases as fall within the jurisdiction of the latter.