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 CONSTITUTION 453 Art. 151 No kind of labor or industry shall be prohibited, unless opposed to good morals, or to the public health or safety,,or unless the interest of the Nation so demand and the law so require. Art. 152 Every author or inventor shall have the exclusive property of his discovery or production for the time specified in the law; and in case the law require said discovery or production to be open to the public, suitable indemnification shall be made to the inventor. CHAPTER XI— General provisions Art. 153 Public instruction is one of the first things to claim the attention of the government. The Congress shall formulate a general plan of na- tional education, and the respective Cabinet Ministers shall annually make a report of the condition of the same throughout the Republic. Art. 154 There shall be an office of Superintendence of public instruction, whose duty it shall be to inspect public teaching under the direction of the government. Art. 155 No payment shall be taken account of in the Treasury of the State, unless made in virtue of a decree, in which the law is cited or the part of the estimate approved by both Chambers which authorizes such expenditure. Art. 156 All Chileans able to bear arms shall be enrolled on the militia lists, unless specially exempted by law. Art. 157 Obedience is the essential necessity of the public forces. No armed body can be a deliberative one. Art. 158 Every resolution made by the President of the Republic, the Sen- ate, or the Chamber of Deputies, in the presence or at the request of an army, or of a general at the head of an armed force, or of any as- semblage of people, who, whether armed or unarmed, shall be diso- bedient to the authorities, is null in law, and of no effect.