Surety liability ends when the principal debt is extinguished, and discharge remains available as a defence in execution.

A surety's liability is co-extensive with the principal debtor's, but it cannot survive once the principal debt is extinguished by merger of estates or satisfaction; the accessory suretyship obligation falls away with the principal obligation. A bond executed in favour of the Court under Section 145 of the Civil Procedure Code was treated as a procedural enforcement device, not as creating a substantive creditor status that would bar ordinary defences. The surety could therefore raise discharge in execution, including the defence that the debt had already been satisfied or extinguished, and the application against the surety failed.

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Issues: (i) Whether the surety remained liable after the principal debtor's liability was extinguished by merger of estates and satisfaction of the debt. (ii) Whether proceedings under Section 145 of the Civil Procedure Code prevented the surety from raising discharge as a defence.

Issue (i): Whether the surety remained liable after the principal debtor's liability was extinguished by merger of estates and satisfaction of the debt.

Analysis: The liability of a surety is co-extensive with that of the principal debtor unless the contract provides otherwise. Where the creditor's rights and the debtor's estate became united in the same hands, the principal obligation was treated as extinguished. The principle of merger depends on the legal effect of the union of interests, and once the plaintiffs had taken over the deceased debtor's estate as legal representatives and transferees, they could not be regarded as keeping the debt alive against the surety. Since the debtor's obligation had ceased, the accessory suretyship obligation could not survive independently.

Conclusion: The surety was not liable, because extinguishment of the principal debt discharged the surety as well.

Issue (ii): Whether proceedings under Section 145 of the Civil Procedure Code prevented the surety from raising discharge as a defence.

Analysis: A bond executed in favour of the Court under Section 145 of the Civil Procedure Code was only a procedural device for enforcing liability and did not convert the Court into a substantive creditor so as to deprive the surety of ordinary defences. The surety could contest liability in execution proceedings, including the defence that the principal debt had already been satisfied or extinguished.

Conclusion: The surety was entitled to raise discharge as a defence, and Section 145 did not bar that defence.

Final Conclusion: The appeal succeeded, the order of the lower appellate court was set aside, and the application against the surety failed.

Ratio Decidendi: A surety's liability cannot survive once the principal debt is extinguished by merger or satisfaction, and a bond executed in favour of the Court under execution procedure does not exclude the surety's substantive defence of discharge.

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