4. When any new trustees have been appointed, whether in the manner prescribed by any such instrument as aforesaid or in the manner hereinbefore provided, the property subject to the trust shall forthwith, notwithstanding anything contained in any such instrument, become vested, without any conveyance or other assurance, in such new trustees and the old continuing trustees jointly, or, if there are no old continuing trustees, in such new trustees wholly, upon the same trusts, and with and subject to the same powers and provisions, as it was vested in the old trustees.