(a) On trust to re-invest if paid off.-
Upon trust, if the same or any part thereof should be discharged by the Government of India, to invest the sum or sums paid by the Government of India, in discharge of the same or any part thereof, in or upon any stocks, funds, or securities in which they are by the provisions of this Act hereinafter authorised to invest the same, and in like manner, as often as the same shall become necessary, to alter, vary and change such stocks, funds, and securities for others of the same or a like nature;