geographical method of treatment must here be pled for as fundamental to any really orderly and comparative treatment of our subject. By descending from source to sea we follow the development of civilisation from its simple origins to its complex resultants; nor can any element of this be omitted. Were we to begin with the peasant hamlet as our initial unit, and forget the hinterlands of pasture, forest, and chase (an error to which the writer on cities is naturally prone), the anthropologist would soon remind us that in forgetting the hunter, we had omitted the essential germ of active militarism, and hence very largely of aristocratic rule. Similarly, [Page: 106] in ignoring the pastoral life, we should be losing sight of a main fount of spiritual power, and this not only as regards the historic religions, but all later culture elements also, from the poetic to the educational. In short, then, it takes the whole region to make the city. As the river carries down contributions from its whole course, so each complex community, as we descend, is modified by its predecessors. The converse is no doubt true also, but commonly in less degree. In this way with the geographer we may rapidly review and extend our knowledge of the grouping of cities. Such a survey of a series of our own river-basins, say from Dee to Thames, and of a few leading Continental ones, say the Rhine and Meuse, the Seine and Loire, the Rhone, the Po, the Danube--and, if possible, in America also, at least the Hudson and Mississippi--will be found the soundest of introductions to the study of cities. The comparison of corresponding types at once yields the conviction of broad general unity of development, structure, and function. Thus, with Metschnikoff we recognise the succession of potamic, thalassic, and oceanic civilisations; with Reclus we see the regular distribution of minor and major towns to have been largely influenced not only by geographical position but by convenient journey distances. Again, we note how the exigencies of defence and of government, the developments of religion, despite all historic diversities, have been fundamentally the same. It is not, of course, to be forgotten how government, commerce, communications, have concentrated, altered or at least disguised the fundamental geographical simplicity of this descending hierarchy from mountain-hamlet to ocean-metropolis; but it is useful for the student constantly to recover the elemental and naturalist-like point of view even in the greatest cities. At times we all see London as still fundamentally an agglomeration of villages, with their surviving patches of common, around a mediaeval seaport; or we discern even in the utmost magnificence of Paris, say its Place de l'Etoile, with its spread of boulevards, but the hunter's tryst by the fallen tree, with its radiating forest-rides, each literally arrow-straight. So the narrow rectangular network of an American city is explicable only by the