John Fiske,
Civil Government in the United States Considered with Some Reference to Its Origins
“ A district judge may, if need be, act as a circuit judge, as a major may command a regiment. All federal judges are appointed by the president, with the consent of the Senate, to serve during good behaviour. Each district has its district attorney, whose business is to prosecute offenders against the federal laws and to conduct civil cases in which the national government is either plaintiff or defendant. Each district has also its marshal, who has the same functions under the federal court as the sheriff under the state court. ”
