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

or even by accidental circumstance without the counsel of either party, it is done; then that which is born from this mixture shall become common property, either by the will of the owners or by necessity itself, provided that the substance of the species has been changed.

XXIX.

For if the substance is not changed, when they can be easily separated, the dominion is not changed or transferred unless they were mixed by the will of the owners.

XXX.

Ninthly, the dominion of things is also acquired by the right of the soil: for whatever is built, planted, or sown in another's soil, it all yields to the soil if it has taken root.

XXXI.

Although the owner of the materials remains the same as he was, he cannot reclaim them nor bring an action for their production original: "ad exhibendum" until they are separated from the building. Nevertheless, while the building stands, he obtains double for the material through the action regarding timber joined to a structure original: "de tigno iniuncto".

XXXII.

Tenthly, by writing: for letters, even if they are gold, by natural reason yield to the paper.

XXXIII.

From which, painting would follow the tablet; however, we see that by a certain civil interpretation and the custom of the Roman people, the contrary has been received due to the excellence of the art.

XXXIV.

Eleventh, by the perception of fruits: for a possessor in good faith, by perceiving the fruits, makes them all his own while he possesses the thing as owner, and is not evicted from it, provided he received and possesses the thing for a just cause.

XXXV.

For if he possesses it without a just cause, and yet through an error of law thinks there is a just title, in this case he acquires only the industrial fruits original: "fructus industriales", as if by the right of specification, but not the natural ones.

xxxvi. Re