erecting a prescriptive right or of being justified by efflux of time’. A little farther on Vasquez says: ‘Things which are imprescriptible by the disposition of the law, may not become objects of prescription even after the lapse of a thousand years’. This statement he supports by countless citations from the jurists.[145]

Every one perceives that no usurpation no matter how long continued is competent to intercept the use of a res communis. And it must also be added, that the authority of those who hold dissenting opinions cannot possibly be applied to the question here at issue. For they are talking about the Mediterranean, we are talking about the Ocean; they speak of a gulf, we of the boundless sea; and from the point of view of occupation these are wholly different things. And too, those peoples, to whom the authorities just mentioned concede prescription, the Venetians and Genoese for example, possess a continuous shore line on the sea, but it is clear that not even that kind of possession can be claimed for the Portuguese.

Further, even if mere lapse of time, as some think, could establish a right by prescription over public property, still the conditions absolutely indispensable for the creation of such a right are in this case absent. The conditions demanded are these: first, all jurists teach that he who sets up a prescriptive right of this sort shall have been in actual possession not only for a considerable period, but from time immemorial; next, that during all that time no one else shall have exercised the same right of possession unless by permission of that possessor or clandestinely; besides that, it is necessary that he shall have prevented other persons wishing to use his possession from so doing, and that such measures be a matter of common knowledge and done by the suffrance of those concerned in the matter. For even if