Institutionum libri
Ex libro VI
Florentinus, Institutes, Book VI. Likewise, precious stones, gems, and other things which we find upon the seashore also at once become ours by natural law.
Florentinus, Institutes, Book VI. The same rule applies to their offspring, born while they are in our hands.
Florentinus, Institutes, Book VI. Unless, having been tamed, they are accustomed to depart and return.
Florentinus, Institutes, Book VI. Likewise, the increase of animals of which we are the owners belongs to us by the same law.
Florentinus, Institutes, Book VI. It is established that the right of alluvium does not exist with reference to land having boundaries. This was also decided by the Divine Pius. Trebatius says that where land taken from conquered enemies is granted under the condition that it shall belong to some city, it will be entitled to the right of alluvium, and has no established boundaries; but that land taken by individuals has prescribed boundaries, so that it may be ascertained what was given, and to whom, as well as what was sold, and what remained public.
Florentinus, Institutes, Book VI. It makes no difference in what way a captive returns, whether he has been sent back, or has escaped from the power of the enemy by force, or strategy; provided that he conies with the intention of not returning thither; for it is not sufficient for anyone merely to return bodily, when his intention is otherwise. Those, however, who are recovered from defeated enemies, are considered to have returned with the right of postliminium.