Estoppel by conduct and curable procedural irregularity: mistaken reliance is essential, and non-transposition need not defeat substantive relief.

Estoppel by conduct under Section 115 of the Indian Evidence Act requires a representation that induces mistaken belief and a resulting detrimental change of position; where the alleged representee knew the true title, silence or attestation does not create estoppel or acquiescence, and a true owner cannot be saddled with improvement costs absent consent. The commentary also explains that non-transposition of a defendant as plaintiff is a curable procedural irregularity under Order I Rule 10(2) CPC, and should not defeat substantive relief where complete justice can still be done. It further notes that future mesne profits may be awarded under Order XX Rule 2 CPC, with Section 99 and Order XLI Rule 33 limiting interference on technical objections.

---

---

Issues: (i) Whether the first defendant was estopped by her conduct from claiming her half share in the suit properties and from resisting liability for improvements; (ii) Whether the decree in favour of the first defendant could be sustained despite the absence of transposition as plaintiff and despite the objection relating to mesne profits.

Issue (i): Whether the first defendant was estopped by her conduct from claiming her half share in the suit properties and from resisting liability for improvements.

Analysis: Estoppel by conduct under Section 115 of the Indian Evidence Act, 1872 requires a representation or conduct inducing a mistaken belief and a consequent alteration of position to the detriment of the person relying on it. The conduct relied upon did not create any such detrimental change of position, because the father knew the true title and could not have been misled by the first defendant's silence, letter, or attestation of the will. The doctrine of acquiescence likewise could not apply, since no mistaken belief or resulting prejudice was shown. A person who knowingly spends money on property without title cannot compel the true owner to bear the cost of improvements in the absence of consent.

Conclusion: The first defendant was not estopped, and she could not be made liable to pay for the alleged improvements.

Issue (ii): Whether the decree in favour of the first defendant could be sustained despite the absence of transposition as plaintiff and despite the objection relating to mesne profits.

Analysis: The objection regarding transposition was purely technical, because the first defendant had admitted the plaintiff's title and claimed relief on the same title. The Court could have ordered transposition under Order I, Rule 10(2) of the Code of Civil Procedure, 1908, and the High Court's decree was protected by the principle that substantial justice should not be defeated by a curable irregularity. As to mesne profits, future mesne profits may be directed under Order XX, Rule 2 of the Code of Civil Procedure, 1908, and the claim in the suit was sufficient to sustain the award in the circumstances of the case. Section 99 and Order XLI, Rule 33 also prevented interference on such a technical ground.

Conclusion: The decree in favour of the first defendant was validly sustained, and the award of future mesne profits was upheld.

Final Conclusion: The appeal failed in entirety, and the decree in favour of the first defendant for possession of her half share and mesne profits was affirmed.

Ratio Decidendi: Estoppel by conduct cannot arise unless the representation causes detrimental reliance by a person who is misled, and a curable procedural irregularity such as non-transposition will not defeat a decree where the court can grant complete relief and substantial justice is otherwise served.

---