... Positiones, de, rerum divisione, et adquirendo earundem iure gentium dominio

XX.
When, however, it happens in a river, it becomes common to those who possess fields near the bank on both sides of the river: according to the measure of the width by which the island touches each person's field, with a line drawn through the middle of the river.

XXI.
Unless, however, it is closer to one side; in which case it is believed to belong only to those whose fields are closer.

XXII.
By the same reason, a riverbed that the river has left and changed also accedes to those who possess the neighboring fields.

XXIII.
A new riverbed, through which the river has begun to flow anew, becomes public: which, however, if the river leaves it, a strict interpretation of the law adjudges and assigns to the owners of the bordering fields.

XXIV.
It is otherwise in an inundation, which, because it changes neither the riverbed nor the nature of the field, cannot change or transfer dominion.

XXV.
Seventhly, dominion is also sought by specification by natural reason: for instance, when a new species is made from another's material, which cannot be reduced to its original form: which is understood to become the property of the one who adorned it with form in good faith.

XXVI.
For if he has built a new species in bad faith, knowing that the material belongs to another, he loses both his labor and the species by civil reasoning.

XXVII.
Unless perhaps he has aggregated and attached another's thing as an accessory to his own as if it were the principal: for in this case, if the species cannot be separated, according to the universal rule, and by both civil and natural reason, the accessory, even if it is more precious, follows the dominion of the principal thing, even if it was done in bad faith.

XXVIII.
Eighthly, by the confusion and mixture of things: which, if by the will of the owners...