[Footnote 134: On electoral procedure see Lowell, Government of England, I., Chap. 10; M. MacDonaugh, The Book of Parliament (London, 1897), 24-50; H. J. Bushby, Manual of the Practice of Elections for the United Kingdom (4th ed., London, 1874); W. Woodings, The Conduct and Management of Parliamentary Elections (4th ed., London, 1900); E. T. Powell, The Essentials of Self-Government, England and Wales (London, 1909); P. J. Blair, A Handbook of Parliamentary Elections (Edinburgh, 1909); and H. Fraser, The Law of Parliamentary Elections and Election Petitions (2d ed., London, 1910). A volume filled with interesting information is J. Grego, History of Parliamentary Elections and Electioneering from the Stuarts to Queen Victoria (new ed., London, 1892). The monumental work upon the entire subject is M. Powell (ed.), Rogers on Elections, 3 vols. (16th ed., London, 1897).] *99. Frequency of Elections: the Campaign.*--General elections do not take place in Great Britain with periodic regularity. The only positive requirement in the matter is that an election must be ordered when a parliament has attained the maximum lifetime allowed it by law. Prior to 1694 there was no stipulation upon this subject and the king could keep a parliament in existence as long as he liked. Charles II. retained for seventeen years the parliament called at his accession. From 1694 to 1716, however, the maximum term of a parliament was three years; from 1716 to 1911 it was seven years; to-day it is five years.[135] In point of fact, parliaments never last through the maximum period, and an average interval of three or four years between elections has been the rule. In most instances an election is precipitated more or less unexpectedly on an appeal to the country by a defeated ministry, and it not infrequently happens that an election turns all but completely upon a single issue and thus assumes the character of a national referendum upon the subject in hand. This was pre-eminently true of the last general election, that of December, 1910, at which the country was asked to sustain the Asquith government in its purpose to curb the independent authority of the House of Lords. In any event, the campaign by which the election is preceded is brief, although it continues throughout the electoral period, and, if the outcome is doubtful, tends to increase rather than to diminish in intensity. Appeals to the voters are made principally through public speaking, the controversial and illustrated press, the circulation of pamphlets and handbills, parades and mass-meetings, and the generous