“ True, the legislature may sometimes, by restrictive legislation in respeet to taxes, seek to prevent the payment by a municipality of its contract obligations, and in such a case the courts will enforce the protective clauses of the Federal Constitution against any state legislation impairing the obligation of a contract. ”

“ The party raising the question of constitutionality and invoking our jurisdiction must be interested in, and affected adversely by, the act, and the interest must by, the decision of the state court be of a personal, and not of an official, nature. ”