Certain things, again, are corporeal, others incorporeal.
1. Corporeal things are those which are by their nature tangible, as land, a slave, a garment, gold, silver, and other things innumerable.
2. Incorporeal things are those which are not tangible, such as are those which consist of a right, as an inheritance, a usufructus, usus, or obligations in whatever way contracted. Nor does it make any difference that things corporeal are contained in an inheritance; fruits, gathered by the usufructuary, are corporeal; and that which is due to us by virtue of an obligation, is generally a corporeal thing, as a field, a slave, or money; while the right of inheritance, the right of usufructus, and the right of obligation, are incorporeal.
3. Among things incorporeal are the rights over estates, urban and rural, which are also called servitutiones.