The doctrine of Incidental and Ancillary powers is an addition to the doctrine of Pith and Substance. In Pith and Substance there can be a situation when a subject of one list touches the subject of another list. On the other hand, the doctrine of Incidental and Ancillary Powers means the power to legislate on a subject and also includes the power to legislate on ancillary matters reasonably connected to that subject, unlike Pith and Substance which deals only with subjects.