Summary

John McLean Cookendorfer v. Preston — Opinion of the Court

A notary is a competent witness on the same ground that other agents are admissible. They are always responsible to their principals for gross negligence, and yet, from the necessity of the case, they are competent witnesses to prove what they have done in the name of their principals.
It appears that the witness, who generally acted as notary for the Bank of Washington, had given a bond, with security in the sum of ten thousand dollars, for the faithful performance of his duty as notary public, in the business of the bank committed to him.
Source: Wikisource

John McLean Cookendorfer v. Preston — Opinion of the Court

But it was also proved, as appears from the record, that the usage was changed in 1818 by all the banks of Washington and Georgetown, 'so as to conform to the general commercial usage of demanding payment on the last day of grace.' This referred to notes or bills sent to the banks for collection, and of course embraces all notes not negotiated in bank.
Where a usage is sanctioned by judicial decisions, it becomes the law of the place, and no further proof is necessary to establish it; and it is said, that no evidence is admissible to controvert the fact, as laid down by the court.
Source: Wikisource

John McLean Cookendorfer v. Preston — Opinion of the Court

A notary is not an officer of the law to demand payment of notes, out is merely an agent of the bank. It has been said, that the bank would not be responsible for an error of the notary, and the case in 3 Cowen cited to sustain it. But in that case the bank was held responsible.
The bank is the agent of the deposition, and the notary is the agent of the bank. In an action by the holder against the indorser, the competency of the notary cannot be affected.
Source: Wikisource

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