How can this fundamental duty be brought home to the individual Englishman? Certainly not by asking him to master the niceties of modern naval technique, matters on which every nation must trust to its experts. But, the broad principles of naval warfare are to-day precisely as they were at Salamis or Lepanto; and to a people such as ours, whose history from its dawn has been moulded by maritime conditions, and which to-day more than ever depends upon free oversea communications for its continued existence, these broad principles governing naval warfare have so real a significance that they may wisely be studied by all classes of the community. Tactics indeed have profoundly altered, and from age to age may be expected to change indefinitely. But so long as the sea remains naval warfare will turn upon the command of the sea; a "Fleet in Being" will not cease to be as real a threat to its foe as it was in the days of Torrington; invasion of oversea territory will always be limited by the same inexorable factors which for centuries have told in favour of the British race and have kept the fields of England inviolate from the tread of a conqueror. There are indications that still more heavy sacrifices will be demanded from the British taxpayer for the upkeep of the Fleet in the future than has been the case even in the recent past. Nothing but iron necessity can justify this unfruitful expenditure, this alienation of the national resources in men and money to the purposes of destruction. Even as it is, naval administrators are finding it increasingly difficult to carry all sections of politicians and the whole of the masses of this country with them in these ever-increasing demands. The best way of ensuring that future generations of Englishmen will rise to the necessary height of a patriotic sense of duty and will record their votes in support of such reasonable demands is to prepare their minds by an elementary knowledge of what naval warfare really means.