[001] subject to your dominion become your property. [Soil] which a river adds to your [002] land by alluvion becomes yours by the jus gentium. Alluvion is an imperceptible [003] increment which is added so gradually that you cannot perceive [how much]8 the [004] increase is from one moment of time to another. Indeed, though you fix your gaze [005] on it for a whole day, the feebleness of human sight cannot distinguish such subtle [006] increases, as may be seen in [the growth of] a gourd and other such things. On the [007] other hand, if the increment is not imperceptible but apparent it will be otherwise, [008] as where the violence of a stream has swept away a parcel of your land and attached [009] it to that of your neighbour; it is clear that it remains yours. If it is attached to [010] your neighbour's land for a long time and the trees it carried with it strike root [011] there, from that time they are deemed to be part and parcel of his property. In the [012] opinion of some, a utilis vindicatio will be given the former owner,9 but [in truth] [013] any recovery of the [tree] itself is at an end since it was made parcel of the other's [014] land and must be termed a different tree, nourished by another soil. The same [015] kind of accession takes place when an island rises in a river, for such, if it lies in [016] the middle of the stream, is the undivided but severally owned property of the [017] landowners on either bank in proportion to the extent of their riparian interests. [018] If it lies nearer to one bank than the other, it belongs to the riparian landowners [019] on that bank only. If an island rises in the sea, which rarely happens, it belongs to [020] the first occupant. You must not think that a person's land, when reduced to the [021] shape of an island, becomes an island, as where a river divides into two above his [022] holding and flows around it, the two streams reuniting below; in such case it will [023] remain the property of him who first owned it. Care must be taken in measuring [024] the nearness of islands, for one may easily be deceived in this matter. Let a point [025] be fixed, therefore, midway between the two lands, and according as the island is [026] within the point it will be the sole property of the one or the other. If it is within [027] the point and on the point and beyond the point, then it will be the undivided but [028] separately owned property of both, so that so much of the island belongs to me as [029] is contained from the mid-point to my land, and so with respect to my neighbour. [030] It is evident that the nearness to and the distance from an island must be decided [031] as of the time it comes into existence. Hence if another island is formed between [032] an island that is nearer to me and the opposite bank of my neighbour across the [033] river, the measurement shall be made from my island and not from my land. All [034] this