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 Rh and then some of the more recent steam wars. In both cases the attempt is made to see how far different conditions would, with due regard to the difference of radius of action, have affected the issue; and to trace with an open mind how far the generally accepted principles of Sea Power were upheld or negatived by these incidents.

The term 'generally accepted principles of Sea Power' is used advisedly and of set purpose. The strictly academical definition of Sea Power matters little or nothing. In the restricted and actual sense—that is to say a navy—it is defined by Captain Mahan as 'necessary from the existence of a peaceful shipping, its extent and its existence governed by that factor. Otherwise it exists as a branch of the usual military establishment.'

This, practically, is all the definition of Sea Power to be drawn from the writings of Captain Mahan. It is since the publication of his famous book that Sea Power has become a sort of occult term, eluding exact definition and perhaps meaning different things to different people. It required definition, and the best and most general is, perhaps, the most common conception of it: 'A naval force sufficient to defeat any naval force of the enemy.'

This implies all else that need be included.

There are two general and existing conceptions, of which the first is a vague understanding of an idea,