To this head may be referred the voluntary separation, which takes place when a nation sends out colonies. For thus a new people as it were is formed, enjoying their own rights; and as Thucydides says, sent out not upon terms of slavery, but equality, yet still owing respect and obedience to their mother-country. The same writer, speaking of the second colony sent by the Corinthians to Epidamnus, says, "they gave public notice that such as were willing to go should enjoy equal privileges with those that staid at home." CHAPTER X. THE OBLIGATION ARISING FROM PROPERTY. Origin and nature of the obligation to restore what belongs to another--Obligation to restore to the rightful owner the profits that have accrued from the unjust possession of his personal or real property--A bona-fide possessor not bound to restitution if the thing has perished--Such bona-fide possessor bound to the restitution of the profits remaining in his hands--Bound to make reparation for the consumption occasioned by his possession--A possessor not bound to make a recompence for a gift, with an exception--The sale of any thing that has been bought, obliges the seller to make restitution, with a certain exception--In what cases a bona-fide purchaser of what belongs to another may retain the price, or a part of it--He who has purchased a thing of one who is not the real owner, cannot return it to that seller--The possessor of a thing whose real owner is unknown, not bound to give it up to any one--A person not bound to restore money received upon a dishonest account, or for service done--Opinion that the property of things valued by weight, number and measure, may be transferred without consent of the owner, refuted. I. Having explained in the preceding part the nature and rights of property, it remains for us to consider the obligation which we incur from thence.