Summary

John McLean Mathewson v. Clarke — Opinion of the Court

The supercargo is the agent of the owners, and disposes of the cargo and makes purchases under their general instructions on his own responsibility.
But Mathewson was master and supercargo, exercising full powers over the vessel and cargo. He purchased and sold where he could do so to the best advantage; and for his entire services in this agency, and for the management of the ship, he was paid. Now, can an agent, thus acting for his principals, engage in a traffic on his own account? He buys for himself and his principals at the same market, and sells at the same.
Source: Wikisource

John McLean Mathewson v. Clarke — Opinion of the Court

The use of the capital of the company, which subjected it to the hazards of trade, under the circumstances, would, on equitable principles, entitle the company to the profits of the enterprise. But looking at the declarations of Mathewson about the time the ship Superior was chartered, and the nature of the enterprise undertaken, we feel authorized to say, that the relation of the parties to each other was not changed by this adventure. The rule applied to the Mercury, in regard to the rights of the complainant and the responsibilities of the defendant, must be applied to the Superior.
Source: Wikisource

John McLean Mathewson v. Clarke — Opinion of the Court

The sound rule of law is, that the master of a vessel must not place himself in a situation where his interest necessarily clashes with that of his owners. Such was not the case here. It is also said, that he should have attended to nothing else than the concerns of his owners. But he was detained at Lima for ten months without a possibility of expediting the business of his ship. Was he to sit down and think for his owners all this time?
We regard Mathewson's latter voyages as being out of the contract altogether. The parties probably never contemplated using any other ship than the Mercury.
Source: Wikisource

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