...443. "When a person affixes Ms property to the land of another, without an agreement permitting Trim to remove it, the thing affixed belongs to the owner of the land, unless he chooses to require the former to remove it. accumulation of material,2 or by the recession...

...so affixed, as well as before. The Civil Code recognizes this rule in section 1013, which declares that: "When a person affixes his property to the land...agreement permitting him to remove it, the thing affixed, except as provided in section ten hundred and nineteen, belongs to the owner of the land, unless he...

...applicable by Congress. The State of California lias enacted legislation dealing with the passage of title when a person affixes his property to the land of...without an agreement permitting him to remove it. Assuming that the United States property in question was affixed to the President's land without any...