Sec. 13. County commissioners to contract for building of courthouse and jail.
   That said county commissioners shall have full power to contract for the building of a suitable courthouse and jail for said county, of such size and dimensions and upon such plan as said commissioners shall determine upon, they being required to take bond and approved security from the contractors for the faithful execution of the work.
(Pub. Laws 1869-70, ch. 36, § 13.)