The second kind of mediate possession is that in which the direct possession is in one who holds both on my account and on his own, but who recognises my superior right to obtain from him the direct possession whenever I choose to demand it. That is to say, it is the case of a borrower, hirer, or tenant at will. I do not lose possession of a thing because I have lent it to some one who acknowledges my title to it and is prepared to return it to me on demand, and who in the meantime holds it and looks after it on my behalf. There is no difference in this respect between entrusting a thing to a servant or agent and entrusting it to a borrower. Through the one, as well as through the other, I retain as regards all other persons a due security for the use and enjoyment of my property. I myself possess whatever is possessed for me on those terms by another.[[237]]

There is yet a third form of mediate possession, respecting which more doubt may exist, but which must be recognised by sound theory as true possession. It is the case in which the immediate possession is in a person who claims it for himself until some time has elapsed or some condition has been fulfilled, but who acknowledges the title of another for whom he holds the thing, and to whom he is prepared to deliver it when his own temporary claim has come to an end: as for example when I lend a chattel to another for a fixed time, or deliver it as a pledge to be returned on the payment of a debt. Even in such a case I retain possession of the thing, so far as third persons are concerned. The animus and the corpus are both present; the animus, for I have not ceased, subject to the temporary right of another person, to claim the exclusive use of the thing for myself; the corpus, inasmuch as through the instrumentality of the bailee or pledgee, who is keeping the thing safe for me, I am effectually excluding all other persons from it, and have thereby attained a sufficient security for its enjoyment. In respect of the effective realisation of the animus domini, there seems to be no essential difference between entrusting a thing to an agent, entrusting it to a bailee at will, and entrusting it to a bailee for a fixed term, or to a creditor by way of pledge. In all these cases I get the benefit of the immediate possession of another person, who, subject to his own claim, if any, holds and guards the thing on my account. If I send a book to be bound, can my continued possession of it depend on whether the binder has or has not a lien over it for the price of the work done by him? If I lend a book to a friend, can my possession of it depend on whether he is to return it on demand or may keep it till to-morrow? Such distinctions are irrelevant, and in any alternative my possession as against third persons is unaffected.

A test of the existence of a true mediate possession in all the foregoing cases is to be found in the operation of the law of prescription. A title by prescription is based on long and continuous possession. But he who desires to acquire ownership in this way need not retain the immediate possession of the thing. He may let his land to a tenant for a term of years, and his possession will remain unaffected, and prescription will continue to run in his favour. If he desires to acquire a right of way by prescription, his tenant’s use of it is equivalent to his own. For all the purposes of the law of prescription mediate possession in all its forms is as good as immediate. In Haig v. West[[238]] it is said by Lindley, L. J.: “The vestry by their tenants occupied and enjoyed the lanes as land belonging to the parish.... The parish have in our opinion gained a title to these parish lanes by the Statute of Limitations. The vestry have by their tenants occupied and enjoyed the lanes for more than a century.”

In the case of chattels a further test of the legal recognition of mediate possession in all its forms is to be found in the law as to delivery by attornment. In Elmore v. Stone[[239]] A. bought a horse from B., a livery stable keeper, and at the same time agreed that it should remain at livery with B. It was held that by this agreement the horse had been effectually delivered by B. to A., though it had remained continuously in the physical custody of B. That is to say, A. had acquired mediate possession, through the direct possession which B. held on his behalf. The case of Marvin v. Wallace[[240]] goes still further. A. bought a horse from B., and, without any change in the immediate possession, lent it to the seller to keep and use as a bailee for a month. It was held that the horse had been effectually delivered by B. to A. This was mediate possession of the third kind, being acquired and retained through a bailee for a fixed term. Crompton, J., referring to Elmore v. Stone, says:[[241]] “In the one case we have a bailment of a description different from the original possession; here we have a loan; but in each case the possession of the bailee is the possession of the bailor; it would be dangerous to distinguish between such cases.”

In all cases of mediate possession two persons are in possession of the same thing at the same time. Every mediate possessor stands in relation to a direct possessor through whom he holds. If I deposit goods with an agent, he is in possession of them as well as I. He possesses for me, and I possess through him. A similar duplicate possession exists in the case of master and servant, landlord and tenant, bailor and bailee, pledgor and pledgee. In all such cases, however, there is an important distinction to be noticed. Mediate possession exists as against third persons only, and not as against the immediate possessor. Immediate possession, on the other hand, is valid as against all the world, including the mediate possessor himself. Thus if I deposit goods with a warehouseman, I retain possession as against all other persons; because as against them I have the benefit of the warehouseman’s custody. But as between the warehouseman and myself, he is in possession and not I. For as against him I have in no way realised my animus possidendi nor in any way obtained a security of use and enjoyment. So in the case of a pledge, the debtor continues to possess quoad the world at large; but as between debtor and creditor, possession is in the latter. The debtor’s possession is mediate and relative; the creditor’s is immediate and absolute. So also with landlord and tenant, bailor and bailee, master and servant, principal and agent, and all other cases of mediate possession.

Here also we may find a test in the operation of prescription. As between landlord and tenant, prescription, if it runs at all, will run in favour of the tenant; but at the same time it may run in favour of the landlord as against the true owner of the property. Let us suppose, for example, that possession for twenty years will in all cases give a good title to land, and that A. takes wrongful possession of land from X., holds it for ten years, and then allows B. to have the gratuitous use of it as tenant at will. In ten years more A. will have a good title as against X., for, as against him, A. has been continuously in possession. But in yet another ten years B., the tenant, will have a good title as against his landlord A., for, as between these two, the possession has been for twenty years in B.

To put the matter in a general form, prescription runs in favour of the immediate against the mediate possessor, but in favour of the mediate possessor as against third persons.

§ 102. Concurrent Possession.

It was a maxim of the civil law that two persons could not be in possession of the same thing at the same time. Plures eandem rem in solidum possidere non possunt.[[242]] As a general proposition this is true; for exclusiveness is of the essence of possession. Two adverse claims of exclusive use cannot both be effectually realised at the same time. Claims, however, which are not adverse, and which are not, therefore, mutually destructive, admit of concurrent realisation. Hence there are several possible cases of duplicate possession.

1. Mediate and immediate possession coexist in respect of the same thing as already explained.