Those whose general authority and jurisdiction are confined within the limits of the county in which they are appointed, who are appointed in and for a particular county, and whose duties apply only to that county, and through whom the county performs its usual political functions. State v. Burns. 38 Fla. 367, 21 South. 290; State v. Glenn, 7 Heisk. (Tenn.) 473; In re Carpenter, 7 Barb. (X. Y.) 34; Philadelphia v. Martin, 125 Pa. 583. 17 Atl. 507.