Upon compliance with the foregoing requisitions, the Registrar of Joint-Stock Companies shall certify under his hand that the Company so applying for registration is incorporated as a Company under this Act, and, in the case of a limited Company, that it is limited ; and thereupon such Company shall be incorporated accordingly ; and all provisions contained in any Deed of Settlement, Law, Royal Charter, or Letters Patent, or other instrument constituting or regulating the Company, shall be deemed to be regulations of the Company within the meaning of this Act ; and all the provisions of this Act shall apply to such Company in the same manner in all respects as if it had been originally incorporated under this Act, subject nevertheless to the reservations hereinafter contained with respect to the existing rights of creditors and other persons, and subject to this proviso, that, except in. so far as is hereinafter permitted, no Company, constituted by any special law, shall have power to alter any of the provisions contained in such law ; and no Company constituted by Royal Charter or Letters Patent shall have power, by a special resolution or otherwise, to alter any of the provisions contained in such Charter or Letters Patent.