This is an action of assumpsit, originally brought in the Justice Court of Providence. The writ was served by summoning the defendant, and also by attaching his personal estate in the hands, or possession, of the Providence Steam Mill, as his trustee. The trustee made affidavit that it was indebted to the defendant in the sum of $20.16, and subsequently, in its answers to the interrogatories propounded by defendant’s attorney, disclosed that this sum was claimed by Michael Fitzpatrick, by virtue of an assignment to him from the defendant, dated the 16th day of October, A. d. 1882.

The Justice Court gave judgment for the plaintiffs, but discharged the garnishee. The plaintiffs thereupon appealed to the Court of Common Pleas, reciting in their reasons of appeal that they had recovered judgment in the Justice Court for, to wit, thirty dollars and costs of suit, and assigning as the only ground of their appeal that the judgment was wrong and erroneous and *530 against the evidence, and that it ought to be reversed and rendered in their favor for their debt, stated in the writ to be thirty-two dollars and sixty cents, and costs.

The appeal was duly entered in the Court of Common Pleas, and being called for trial, the defendant submitted, and the court gave judgment for the plaintiffs for thirty two dollars and sixty cents and costs. On the plaintiffs’ motion to charge the garnishee, the court ruled that the garnishee was not liable, and discharged it. To this ruling and judgment discharging the garnishee, the plaintiffs excepted.

The defendant contends that the question raised by the exception must be considered as res adjudicata. He argues, that inasmuch as the garnishee was discharged by the Justice Court, and as the appeal bond and reasons of appeal expressly state that the matter appealed from was the judgment awarding to the plaintiffs the specific sum set forth, and do not allege any error in the judgment discharging the garnishee, the question of the garnishee’s liability must be regarded as having been finally settled by the Justice Court.

The ai’gument, though plausible, is not valid. The court is not called upon to pass upon the liability of the garnishee, until the plaintiff has established his claim and obtained a judgment against the defendant. If the plaintiff fails in the suit against the defendant, the question of the garnishee’s liability does not arise. The proceeding against the garnishee is, therefore, incidental or subsidiary to the suit, designed to secure to the plaintiff, if he prevails, payment of his judgment. Being a mere incident of the suit, an appeal from the principal judgment brings it up as a part of the suit.

We are of opinion that the court erred in its ruling discharging the garnishee. To make an assignment of wages to be earned valid, it is necessary that there should be a subsisting contract, or engagement, out of which the wages are to accrue. Tiernay v. McGarity, ante, p. 231, and cases cited. The record does not show that the sum due to the defendant from the garnishee for wages earned was so due under any contract or engagement, subsisting at the date of the assignment from the defendant to Fitzpatrick. So far from such being the fact, it may be fairly inferred *531 from the assignment that the defendant, at its execution, was in the employment of the Slater Cotton Company under a continuing engagement. Whether he would thereafter be employed by any other person was uncertain, a mere possibility. Though the instrument may have been a valid assignment of moneys due, or to become due, from the Slater Cotton Company, it was invalid in respect to earnings in the employment of others, between whom and the defendant no contract or engagement, as employer and employed, existed at its execution. Such earnings constituted a mere possibility, uncoupled with an interest, and were incapable of assignment. Mulhall v. Quinn and Trustees, 1 Gray, 105, 107; 2 Kent Comment. *468 [641, note (a), 10th ed.].

The exceptions are sustained. Judgment of the Court of .Common Pleas against the defendant is affirmed with costs of this court. Judgment of the Court of Common Pleas discharging the garnishee is reversed and the garnishee charged in the sum of $20.16.