Summary

Samuel Nelson Oelricks v. Ford — Opinion of the Court

They express opinions upon the subject of a margin as a right to be exercised in their own business, but admit that it is not founded upon any general usage; and none of them speak of its having been claimed or exercised in his own business but in one or two instances. Whether a usage or custom of the kind set up existed in the trade in Baltimore, was a question of fact to be proved by persons who had a knowledge of it from dealing in the article of flour.
Source: Wikisource

Samuel Nelson Oelricks v. Ford — Opinion of the Court

The broker who negotiated the contract for the defendants states that he considered it a clearly understood right of both parties to such contracts to demand a margin to a reasonable amount; that he entertained the belief, from conversations with various merchants on the subject; that he recollected but one instance where, when the demand was made, the margin was put up, which was a margin of twenty-five cents on the barrel in a contract for 500 barrels.
Source: Wikisource

Samuel Nelson Oelricks v. Ford — Opinion of the Court

So where stipulations in the contract refer to matters outside of the instrument, parol proof of extraneous facts may be necessary to interpret their meaning. As a general rule, there must be ambiguity or uncertainty upon the face of the written instrument, arising out of the terms used by the parties, in order to justify the extraneous evidence, and, when admissible, it must be limited in its effect to the clearing up of the obscurity. It is not admissible to add to or engraft upon the contract new stipulations, nor to contradict those which are plain.
Source: Wikisource

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