Mr. Justice Wilkin

delivered the opinion of the court:

In the county court of Cook county the county collector made application for judgment on account of the delinquent fifth installment of a special assessment levied by the city of Chicago for the improvement of Prairie avenue. The appellant appeared and filed an objection, which sets forth that when application was made in the previous year to obtain a tax judgment for the delinquent fourth installment of the same assessment, the county court refused judgment because of the invalidity of the ordinance in the special assessment proceeding. This former finding in favor of the appellant, it is claimed, is res judicata. To sustain his objection he offered in evidence the petition, assessment roll, judgment of confirmation, and the objections and all other papers and files belonging to the special assessment proceeding. He next offered the judgment of the county court refusing judgment on said former installment, and also the objections filed by him therein, and showed by a "witness who was present at that trial that the court refused judgment on account of the invalidity of the ordinance. All of this evidence was admitted, but after hearing it the court found against the appellant.

This record presents the question of whether an order of the county court refusing judgment for one installment of a special assessment is conclusive on an application for a judgment for a subsequent installment of the same assessment on the same piece of property, where the finding of the court in the first proceeding was that the ordinance on which the assessment was based was invalid. In the light of a well settled rule this question must be answered in the affirmative. “Where the former adjudication is relied upon as an absolute bar, there must be, as between the two actions, identity of parties, of subject matter and cause of action. There is, however, a clearly defined distinction between that class of cases and where some controlling fact or matter material to the determination of both causes has been adjudicated in a former proceeding in a court of competent jurisdiction, and the same fact or matter is again at issue between the same parties. In this latter Case the adjudication of the fact or matter in the first suit will, if properly presented, be conclusive of the same question in the latter suit, irrespective of whether the cause of action is the same in both suits or not. This is generally denominated estoppel by verdict.” Leopold v. City of Chicago, 150 Ill. 568; Wright v. Griffey, 147 id. 496; Hanna v. Read, 102 id. 596.

Admitting that the subject matter in the two applications is not the same, in one case it being the fourth installment and in the other the fifth, still, they are both parts of one assessment and based on one judgment of confirmation. However this may be, it is clear, upon the authorities cited, the court having held, upon the application for judgment on a former installment, that the ordinance on which the judgment of confirmation is based is void, it decided a material and essential fact to a recovery in this case. And as we said in Hanna v. Read, supra, (on p. 603): “Whether the adjudication relied on as an estoppel goes to a single question or all the questions involved in the cause, the fundamental principle upon which it is allowed in either case is, that justice and public policy alike demand that a matter, whether consisting of one or many questions, which has been solemnly adjudicated by a court of competent jurisdiction, shall be deemed finally and conclusively settled in any subsequent litigation between the same parties where the same question or questions arise, except where the litigation is a direct proceeding for the purpose of reversing or setting aside such adjudication.”

We see no reason why the same question should be re-litigated each time an installment of.an invalid special assessment falls due. The holding of the county court being to the contrary, its judgment must be reversed.

Reversed and remanded.