128 BULLETIN 1224, U. S. DEPARTMENT OF AGRICULTURE. 
Table 2. — County groups used in this study. 
District, State, and county. 
District, State, and county. 
District, State, and county. 
Group 1. 
Group 7— Continued. 
Group 10— Continued. 
Vermont: 
Ohio— Continued. 
Illinois— Continued. 
Addison. 
Franklin. 
Whiteside. 
Franklin. 
Hardin. 
Woodford. 
Orange. 
Madison. 
Iowa: 
Rutland. 
Mercer. 
Adair. 
Windsor. 
Morrow. 
Audubon. 
New York: 
Pickaway. 
Benton. 
Columbia. 
Putnam." 
Boone. 
Franklin. 
Union. 
Buchanan. 
Washington. 
Crawford. 
Cedar. 
Massachusetts: 
Erie. 
Cherokee. 
Berkshire. 
Fulton. 
Clinton. 
Franklin. 
Huron. 
Carroll. 
Hampden. 
Lucas. 
Crawford. 
Hampshire. 
Middlesex. 
Wood. 
Dallas. 
Indiana: 
Fayette. 
Worcester. 
Allen. 
Greene. 
Bartholomew. 
Guthrie. 
Group 2. 
Boone. 
Hamilton. 
Franklin. 
Hancock. 
New York: 
Grant. 
Ida. 
Delaware. 
Hamilton. 
Iowa. 
Otsego. 
Hendricks. 
Jackson. 
"Ulster. 
Henry. 
Jasper. 
Pennsylvania: 
Jay. 
Johnson. 
Pike. 
Madison. 
Jones. 
Wayne. 
Marshall. 
Keokuk. 
Miami. 
Linn. 
Group 3. 
Montgomery. 
Lyon. 
Putnam. 
Madison. 
New York: 
Shelby. 
Marshall. 
Cortland. 
Tipton. 
Muscatine. 
Livingston. 
Onondaga. 
Vigo. 
Osceola. 
Wells. 
Plymouth. 
Oswego. 
Polk. 
Seneca. 
Group 8. 
Poweshiek. 
Wyoming. 
Chautauqua. 
Michigan: 
Sac. 
Lapeer. 
Sioux. 
Lenawee. 
Story. 
Group 4. 
Oakland. 
Scott. 
Sanilac. 
Tama. 
Pennsylvania: 
Washtenaw. 
Winnebago. 
Butler. 
Cass. 
Winneshiek. 
Clearfield. 
Kent. 
Wright. 
Indiana. 
Allegan. 
Missouri: 
Ottawa. 
Nodaway. 
Group 5. 
Van Buren. 
Kansas: 
Brown. 
Pennsylvania: 
Group 9. 
Jackson. 
Center. 
Wisconsin: 
Jefferson. 
Luzerne. 
Dane. 
Nemaha. 
Lycoming. 
Dodge. 
Fond du Lac 
Nebraska: 
Burt. 
Group 6. 
Jefferson. 
Butler. 
Richland. 
Cedar. 
Ohio: 
Rock. 
Cuming. 
Ashtabula. 
Walworth. 
Dakota. 
Columbiana. 
Illinois: 
Dixon. 
Cuyahoga. 
Boone. 
Dodge. 
Holmes. 
Kane. 
Ga?e. 
Lorain. 
McHenry. 
Jefferson. 
Mahoning. 
Knox. 
Medina. 
Group 10. 
Lancaster. 
Stark. 
Illinois : 
Madison. 
Summit. 
Bureau. 
Nuckolls. 
Wayne. 
Carroll. 
Pawnee. 
Hocking. 
DeKalb. 
Pierce. 
Jackson. 
Ford. 
Saline. 
Monroe. 
Iroquois. 
Saunders. 
Muskingum. 
Kankakee. 
Seward. 
Perry. 
Washington. 
La Salle. 
Stanton. 
Lee. 
Thayer. 
Livingston . 
Thurston. 
Group 7. 
Marshall . 
Wayne. 
McLean. 
Webster. 
Ohio: 
Ogle. 
South Dakota: 
Auglaize. 
Putnam. 
Bon Homme. 
Clark. 
Stark. 
Clay. 
Delaware. 
Stevenson. 
Lake. 
Fayette. 
Winnebago. 
Lincoln. 
