Summary

David Davis De Haro v. United States — Opinion of the Court

But here, in the case of a private individual granting the right to use the most valuable property at his own pleasure, it would be an evident absurdity to put such license in the form of a solemn document, clothe it with legal formalities, give notice thereof to the world by registration, that he has done what simply allowed another to use his estate until he chooses to put him off, it may be, the next hour; for a power of revocation at will gives no fixed time to the licensee.
Source: Wikisource

David Davis De Haro v. United States — Opinion of the Court

There is a clear distinction between the effect of a license to enter lands, uncoupled with an interest, and a grant. A grant passes some estate of greater or less degree, must be in writing, and is irrevocable, unless it contains words of revocation; whereas a license is a personal privilege, can be conferred by parol or in writing, conveys no estate or interest, and is revocable at the pleasure of the party making it.
Source: Wikisource

David Davis De Haro v. United States — Opinion of the Court

If language has any meaning, Micheltorena, intended by this instrument to give nothing more than the power to occupy, and even this power was made expressly subject to the paramount claim of the establishment of San Francisco. To permit pasture-ground to be occupied, excludes all idea that a grant of the land was contemplated. There are, absolutely, no words indicating an intention to make a future grant on the happening of any event whatever.
Source: Wikisource

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