In the gathering currents of our present-day social evolution, and especially in this country where progress is not feared, this heavy undertow is being somewhat overcome. Things move so rapidly now that one life counts the changes, there is at last a sense of motion in human affairs, and so these healthful processes of change can have free way. The dangers to be met to-day by the home-builder are far different from those of ancient times, and, like most of our troubles, are largely of our own making. Earthquake and tidal wave still govern our choice of place and material somewhat, and climate of course always, but fire is the chief element of danger in our cities, and next to fire the greatest danger in the home is its own dirt. The savage was dirty in his habits, from our point of view, but he lived in a clean world large enough to hold his little contribution of bones and ashes, and he did not defile his own tent with detritus of any sort. We, in our far larger homes, with our far more elaborate processes of living, and with our ancient system of confining women to the home entirely, have evolved a continuous accumulation of waste matter in the home. The effort temporarily to remove this waste is one of the main lines of domestic industry; the effort to produce it is the other. Just as we may watch the course of evolution from a tiny transparent cell, absorbing some contiguous particle of food and eliminating its microscopic residuum of waste, up to the elaborate group of alimentary processes which make up so large a proportion of our complex physiology; so we may watch the evolution of these home processes from the simple gnawing of bones and tossing them in a heap of the cave-dweller, to the ten-course luncheon with its painted menu. In different nations the result varies, each nation assumes its methods to be right, and, so assuming, labours on to meet its supposed needs, to fulfil its local ambitions and duties as it apprehends them. And in no nation does it occur to the inhabitants to measure their habits and customs by the effect on life, health, happiness, and character.