But it no more follows, from the single circumstance that certain facts must concur in order to create the rights incident to possession, that they must continue in order to keep those rights alive, than it does, from the necessity of a consideration and a promise to create a right ex contractu, that the consideration and promise must continue moving between the parties until the moment of performance. When certain facts have once been made manifest which confer a right, there is no general ground on which the law need hold the right at an end except the manifestation of some fact inconsistent with its continuance, [237] the reasons for conferring the particular right have great weight in determining what facts shall be to be so. Cessation of the original physical relations to the object might be treated as such a fact; but it never has been, unless in times of more ungoverned violence than the present. On the same principle, it is only a question of tradition or policy whether a cessation of the power to reproduce the original physical relations shall affect the continuance of the rights. It does not stand on the same ground as a new possession adversely taken by another. We have adopted the Roman law as to animals ferae naturae, but the general tendency of our law is to favor appropriation. It abhors the absence of proprietary or possessory rights as a kind of vacuum. Accordingly, it has been expressly decided, where a man found logs afloat and moored them, but they again broke loose and floated away, and were found by another, that the first finder retained the rights which sprung from his having taken possession, and that he could maintain trover against the second finder, who refused to give them up. /1/