they shall by virtue of their offices, be conservators of the peace, with full powers to the extent hereinafter prescribed, in all cases of crimes and misdemeanors, whether committed by citizens of the United States or by Indians within the frontier line aforesaid. That they shall have power to administer oaths, to be valid in the several courts of the United States, to perpetuate testimony to be used in said courts, to take acknowledgments of deeds and other specialties in writing, to take probate of wills and the testaments executed upon the said frontier, of which the testators shall have died in transit between the State of Missouri and the Territory of Oregon, and to do and certify all notarial acts, and to perform the ceremony of marriage, with as legal effect as if the said several acts above enumerated had been performed by the magistrates of any of the States having power to perform the service. That they shall have power to arrest and remove from the line aforesaid all disorderly white persons, and all persons exciting the Indians to hostilities, and to surrender up all fugitives from justice upon the requisition of the Governor of any of the States; that they shall have power to demand of the several tribes within the said frontier line, the surrender of any Indian or Indians committing acts in contradiction of the 330 laws of the United States, and in case of such surrender, to inflict punishment thereon
