Divisions of the law of property:
1. Ownership of material things—Corporeal property.
2. Rights in re propria in immaterial things: e.g. patents and
trade-marks.
3. Rights in re aliena over material or immaterial things: e.g.
leases, trusts, and securities.
The ownership of material things.
Its essential qualities:
1. Generality.
2. Permanence.