For a like reason, occupation or first possession becomes the foundation of property. Where a man bestows labour and industry upon any object, which before belonged to no body; as in cutting down and shaping a tree, in cultivating a field, &c., the alterations, which he produces, causes a relation between him and the object, and naturally engages us to annex it to him by the new relation of property. This cause here concurs with the public utility, which consists in the encouragement given to industry and labour. Perhaps too, private humanity towards the possessor concurs, in this instance, with the other motives, and engages us to leave with him what he has acquired by his sweat and labour; and what he has flattered himself in the constant enjoyment of. For though private humanity can, by no means, be the origin of justice; since the latter virtue so often contradicts the former; yet when the rule of separate and constant possession is once formed by the indispensable necessities of society, private humanity, and an aversion to the doing a hardship to another, may, in a particular instance, give rise to a particular rule of property. I am much inclined to think, that the right succession or inheritance much depends on those connexions of the imagination, and that the relation to a former proprietor begetting a relation to the object, is the cause why the property is transferred to a man after the death of his kinsman. It is true; industry is more encouraged by the transference of possession to children or near relations: but this consideration will only have place in a cultivated society; whereas the right of succession is regarded even among the greatest Barbarians. Acquisition of property by accession can be explained no way but by having recourse to the relations and connexions of the imaginations. The property of rivers, by the laws of most nations, and by the natural turn of our thoughts, is attributed to the proprietors of their banks, excepting such vast rivers as the Rhine or the Danube, which seem too large to follow as an accession to the property of the neighbouring fields. Yet even these rivers are considered as the property of that nation, through whose dominions they run; the idea of a nation being of a suitable bulk to correspond with them, and bear them such a relation in the fancy. The accessions, which are made to land, bordering upon rivers, follow the land, say the civilians, provided it be made by what they call alluvion, that is, insensibly and imperceptibly; which are circumstances, that assist the imagination in the conjunction.