HELD : (1) A judgment within the meaning of Cl. 15 would have to satisfy two tests, {a) it must be the final pronouncement which puts an end to the pro~ ceeding so far as the Court dealing with it is concerned; and (b) it must involve the deterinination of some right or liability though it may not be necessary that there must be a decision on the merits. [554 BJ ln finding out whether any decision is a' judgment within the meaning of Cl. 15, each case must be looked into in order to find out whether there is a decision <ietemining the right or liability of the parties affecting the merits of the controversy between the parties .. It is not the form but the nature of the order that has to be examined in- order to ascertain whether there has been a determination of any .right or liability. If an amendment merely allows the plaintiff to state a new cause of action or to ask a new relief or to include a new ground of relief al] that happens is that it is possible for the plaintiff to raise further contentions in the suit, but it is not <lecided whether the contentions are right. Such an amendment does nothing more than regulate the procedure applicable to the suit and does not touch the merits of the controversy between the parties. Where, on the other hand, an amendment takes away from the defendant the defence of immunity from any liability_ by reason of limitation, it is a judgment within the meaning of CL 15. The reason why it be·Comes a judgment is that it is a decision affecting the merits of the question between the parties by determining the right or liability based on limitation. It is the final deCision as far as the Court is concerned. The respondent, in the present case, has acquired. by reason of limitation, immunity from liability, and the appellant, because of the limitation of the cause of action, has no power to render the respon<lent liable for the alleged claim. [554 B-C, G., 555F-H,556A-C] (2) The order of the trial Court is not one purely based on discretion, and even with regard to discretionary orders the appellate Court can interfere where the order is unsupportable in law or is unjust. The High Court was right in holding that there were no special circumstances to entitle the appellant to introduce the claim by amendment. [556F] Asrumati Debi v. Kumar Rupendra Deb Raikot & Ors. [1953} S. C. R. 1159, followed. Justice of the Peace for Calcutta v. Oriental Gas Company, 8 Bengal L. R. 433, Tu/l'aram v. A/agappa I. L. R. 35 Mad. 1., M. B. Sirkar & Sons v. Powell & Co. A.I.R. 1956. Cal. 630, approved. Charan Das v. Amir Khan 47 I. A. 255 referred to. Dayahhai v. Murugappa Chettiar I. L. R. 13 Rang. 457 and Manohar v . . B11i/ram I.L. R. 1952 Nag. 471, overruled.