social advance beyond the limits we have already reached, but even of any fundamental reconstruction of what the war will have destroyed. Perhaps we might have foretold this from the case of Ireland immediately under our eyes. Failure to solve her national problem has arrested Ireland’s development since the seventeenth century, and imprisoned her in a world of ideas almost unintelligible to an Englishman till he has traveled in the Balkans. This has been England’s fault, and we are now at last in a fair way to remedy it. The moment we have succeeded in arranging that the different national groups in Ireland govern themselves in the way they really wish, the national question will pass from the Irish consciousness; they will put two centuries behind them at one leap, and come into line with ourselves. The Dublin strike, contemporary with the arming of the Volunteers, shows how the modern problems are jostling at the heels of the old. Although “Unionist” and “Nationalist” politicians could still declare that their attitude towards the strike was neutral, the parliament of the new Irish state will discuss the social problem and nothing else. [Sidenote: Nationality is subjective not material.] Ireland, then, has forced us to think about the problem of nationalism; and our Irish experience will be invaluable to us when peace is made, and we take in hand, in concert with our allies, the national questions of the rest of Europe. To begin with, we already have a notion of what Nationality is. Like all great forces in human life, it is nothing material or mechanical, but a subjective psychological feeling in living people. This feeling can be kindled by the presence of one or several of a series of factors: a common country, especially if it is a well defined physical region, like an island, a river basin, or a mountain mass; a common language, especially if it has given birth to a literature; a common religion; and that much more impalpable force, a common tradition or sense of memories shared from the past. [Sidenote: “Historical sentiment” is largely factitious.]