Summary

Portrait of Noah Haynes Swayne Noah Haynes Swayne Carpenter v. Longan — Opinion of the Court

Equity puts the principal and accessory upon a footing of equality, and gives to the assignee of the evidence of the debt the same rights in regard to both. There is no departure from any principle of law or equity in reaching this conclusion. There is no analogy between this case and one where a chose in action standing alone is sought to be enforced. The fallacy which lies in overlooking this distinction has misled many able minds, and is the source of all the confusion that exists. The mortgage can have no separate existence. When the note is paid the mortgage expires.
Source: Wikisource

Portrait of Noah Haynes Swayne Noah Haynes Swayne Carpenter v. Longan — Opinion of the Court

It is the policy of the law to avoid circuity of action, and parties ought not to be driven from one forum to obtain a remedy which cannot be denied in another.
The mortgaged premises are pledged as security for the debt. In proportion as a remedy is denied the contract is violated, and the rights of the assignee are set at naught. In other words, the mortgage ceases to be security for a part or the whole of the debt, its express provisions to the contrary notwithstanding.
Source: Wikisource

Portrait of Noah Haynes Swayne Noah Haynes Swayne Carpenter v. Longan — Opinion of the Court

The transfer of the note carries with it the security, without any formal assignment or delivery, or even mention of the latter. If not assignable at law, it is clearly so in equity. When the amount due on the note is ascertained in the foreclosure proceeding, equity recognizes it as conclusive, and decrees accordingly. Whether the title of the assignee is legal or equitable is immaterial. The result follows irrespective of that question. The process is only a mode of enforcing a lien.
All the authorities agree that the debt is the principal thing and the mortgage an accessory.
Source: Wikisource

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