It shall and may be lawful for the Court or a Judge, at any Time before the Trial of any Cause, to order that any Person or Persons, not joined as Plaintiff or Plaintiffs in such Cause, shall be so joined; or that any Person or Persons, originally joined as Plaintiff or Plaintiffs, shall be struck out from such Cause, if it shall appear to such Court or Judge that Injustice will not be done by such Amendment, and that the Person or Persons, to be added as aforesaid, consent, either in Person or by Writing, under his, her, or their Hands, to be so joined, or that the Person or Persons, to be struck out as aforesaid, were originally introduced without his, her, or their Consent, or that such Person or Persons consent in Manner aforesaid to be so struck out; and such Amendment shall be made upon such Terms as to the Amendment of the Pleadings (if any), Postponement of the Trial, and otherwise, as the Court or Judge by whom such Amendment is made shall think proper; and when any such Amendment shall have been made, the Liability of any Person or Persons, who shall have been added as Co-plaintiff or Co-plaintiffs, shall, subject to any Terms imposed as aforesaid, be the same as if such Person or Persons had been originally joined in such Cause.