Provided always, that in any of the cases herein-before provided with respect to lands subject to securities, if in the deed or instrument creating the same a time shall have been limited within which the holder of the security shall not be obliged to receive payment of the principal money thereby secured, and under the provisions herein-before contained the holder of the security shall have been required to accept payment of his claim, or of part thereof, at a time earlier than the time so limited, the promoters of the undertaking shall pay to the holders of the security, in addition to the sum which shall have been so paid off, all such expences as shall be incurred by him in respect of or which shall be incidental to the re-investment of the sum so paid off, such expences, in case of difference, to be taxed, and payment thereof enforced, in the manner herein provided with respect to the expences of conveyances.