An act of congress was approved increasing the legislative council to thirteen members.

The evidence

• “By an act of congress, approved February 5, 1825, the legislative council was increased to thirteen members and by another act, approved January 29, 1827, the electors of the territory were authorized to elect the members of the council, without submitting names to the president for appointment.”

  1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 125 / book p. 111

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources