Section 182

The power to tax corporations and their property shall never be surrendered or abridged by any contract or grant to which the State or any political subdivision thereof may be a party, except that the legislature may grant exemptions from taxation in the encouragement of manufactures and other new enterprises of public utility extending for a period not exceeding five years, the time of such exemptions to commence from date of charter, if to a corporation; and if to an individual enterprise, then from the commencement of work; but when the legislature grants such exemptions for a period of five years or less, it shall be done by general laws, which shall distinctly enumerate the classes of manufactures and other new enterprises of public utility entitled to such exemptions, and shall prescribe the mode and manner in which the right to exemptions shall be determined.