With regard to the real and personal estate of every person dying after the commencement of this Act, there shall be abolished: (a) all existing modes, rules and canons of descent, and of devolution by special occupancy or otherwise, of real estate, or of personal estate; (b) tenancy by the curtesy; (c) dower. The residuary estate of an intestate shall he distributed in the manner mentioned in section 4. Where under this Part the residuary estate of an intestate or any part thereof devolves upon