Provided always and be it enacted That the said Co[m]missioners to be appointed for taking Subscriptions as aforesaid shall or may accept and take from the Subscribers of any part of the said Five and twenty hundred sixty and foure thousand Pounds Subscriptions of Lands Rents or other annual Interests or Payments to be mortgaged to the said Governor and Company for securing the last Payment of the several Su[m]ms to be by them subscribed Provided that this Clause shall not extend to above One Fourth part of the said Subscriptions.