Where, as in this case, the judge sustains a plea of res judicata without hearing any evidence and there being no ■admissioni of the -truth of the plea shown in the record, the trial -court could not take judicial cognizance of the *473 former judgment in another case between the same parties and enter an order sustaining the plea. Salter v. Heys, 207 Ga. 591 (3) (63 S. E. 2d 376); Roughton v. Thiele Kaolin Co., 211 Ga. 15 (83 S. E. 2d 590); Davenport v. Southern Ry, Co., 42 Ga. App. 160 (2) (155 S. E. 340); Glaze v. Bogle, 105 Ga. 295 (3) (31 S. E. 169). The judge erred in sustaining the plea of res judicata.

Judgment reversed."