The error was made easier by a different use of the phrase in a different connection. A bailee was in general liable for goods stolen from his custody, whether he had a lien or not. But the law was otherwise as to a [244] pledgee, if he had kept the pledge with his own goods, and the two were stolen together. /1/ This distinction was accounted for, at least in Lord Coke's time, by saying that the pledge was, in a sense, the pledgee's own, that he had a special property in it, and thus that the ordinary relation of bailment did not exist, or that the undertaking was only to keep as his own goods. /2/ The same expression was used in discussing the pledgee's right to assign the pledge, /3/ In this sense the term applied only to pledges, but its significance in a particular connection was easily carried over into the others in which it was used, with the result that the special property which was requisite to maintain the possessory actions was supposed to mean a qualified interest in the goods. With regard to the legal consequences of possession, it only remains to mention that the rules which have been laid down with regard to chattels also prevail with regard to land. For although the plaintiff in ejectment must recover on the strength of his own title as against a defendant in possession, it is now settled that prior possession is enough if the defendant stands on his possession alone Possession is of course sufficient for trespass.5 And although the early remedy by assize was restricted to those who had a technical seisin, this was for reasons which do not affect the general theory. Before closing I must say a word concerning ownership and kindred conceptions. Following the order of analysis [245] which has been pursued with regard to possession, the first question must be, What are the facts to which the rights called ownership are attached as a legal consequence? The most familiar mode of gaining ownership is by conveyance from the previous owner. But that presupposes ownership already existing, and the problem is to discover what calls it into being.