Section 4. In the case of a suit for compensation for an act which does not give rise to a cause of action unle

24. In the case of a suit for compensation for an act which does not give rise to a cause of action unless some specific injury actually results therefrom, the period of limitation shall be computed from the time when the injury results. Illustration. A owns the surface of a field. B owns the subsoil. B digs coal thereout without causing any immediate apparent injury to the surface, but at last the surface subsides. The period of limitation in the case of a suit by A against B runs from the time of the subsidence. Computation of time mentioned in instruments.