So far the discussion has been confined to the general principles of liability, and to the mode of ascertaining the point at which a man begins to act at his own peril. But it does not matter to a man whether he acts at his own peril or not, unless harm comes of it, and there must always be some one within reach of the consequences of the act before any harm can be done. Furthermore, and more to the point, there are certain forms of harm which are not likely to be suffered, and which can never be complained of by any one except a person who stands in a particular relation to the actor or to some other person or thing. Thus it is neither a harm nor a wrong to take fish from a pond unless the pond is possessed or owned by some one, and then only to the possessor or owner. It is neither a harm nor a wrong to abstain from delivering a bale of wool at a certain time and place, unless a binding promise has been made so to deliver it, and then it is a wrong only to the promisee. The next thing to be done is to analyze those special relations out of which special rights and duties arise. The chief of them--and I mean by the word "relations" relations of fact simply--are possession and contract, and I shall take up those subjects successively. The test of the theory of possession which prevails in any system of law is to be found in its mode of dealing [165] who have a thing within their power, but not own it, or assert the position of an owner for with regard to it, bailees, in a word. It is therefore, as a preliminary to understanding the common-law theory of possession, to study the common law with regard to bailees. The state of things which prevailed on the border between England and Scotland within recent times, and which is brought back in the flesh by the ballad of the Fray O'Suport, is very like that which in an earlier century left its skeleton in the folk-laws of Germany and England. Cattle were the principal property known, and cattle-stealing the principal form of wrongful taking of property. Of law there was very little, and what there was depended almost wholly upon the party himself to enforce. The Salic Law of the fifth century and the Anglo-Saxon laws of Alfred are very full in their directions about following the trail. If the cattle were come up with before three days were gone, the pursuer had the fight to take and keep them, subject only to swearing that he lost them against his will. If more than three days went by before the cattle were found, the defendant might swear, if he could, to facts which would disprove the claimant's loss.