1. Where after a definite determination the Court of Appeals has reversed and remanded a cause for further action in the trial court, and the unsuccessful party does not -prosecute error therefrom to this court, and the trial court has proceeded in substantial conformity with the directions of the Court of Appeals, its action will not be questioned on a second review, even though upon such second review the Court of Appeals should be of the opinion that its former determination was erroneous.

2. In such event the pronouncement bf the court of appeals becomes the law of the case as a rule of practice though not a binding precedent for future cases and upon error being-prosecuted from the second review to this court such former determination will not be disturbed.

3. It the trial court misconstrues the directions of the Court of Appeals and does not give full effect to its mandate a new review is appropriate, and if error intervened in such second trial the Court of Appeals should reverse and remand the cause for new trial under proper instructions.

4. Where a grade has not been adopted for a street in a municipality and a property owner erects improvements upon property fronting upon such street with reference to a reasonable grade thereafter to be established, and after completion of such improvements a grade is established by such municipality, resulting in damage to the property so improved,, in an action for damages the inquiry relates to the reasonableness of the grade, so established.

5. If such improvements were erected with reference to a reasonable grade, and such established grade is found to be unreasonable the measure of damages is the difference between the market value of. the real estate at a reasonable grade with the improvements thereon and the market value of the real estate with the improvements thereon at the unreasonable grade so established.

6. In a suit for damages caused by change of grade an inquiry may be made into the cost and expense of alterations and restorations for the purpose of adjusting the property and its improvements to the new conditions created by the change of grade. This is, however, not for the purpose of ascertaining the extent of the property owner’s damage. Its purpose is to ascertain whether the damages shown by decrease in market value can be minimized by resorting to alterations and adjustments. This inquiry can only be pursued when the cost of the proposed alterations is less than the damages proyed, as shown by the difference in Values before and' after ‘the improvement.

Judgment affirmed,