"The difficulty of dealing with Admiralty Reports by way of authority is, that there is no necessity in that Court that the Judge should, in the exposition of the grounds of his judgment, discriminate strictly between the proposition of law which is to be satisfied by all the facts of the case, and the rule of interpretation of the direct facts of maritime vicissitudes given in evidence, by which he desires to bind himself and his successors as to the inference of fact he and they ought, as a general rule, to draw from those facts."