The distinctively home-made product changes far less. We see most progress in the physical characteristics of the home, its plan, building, materials, furnishings, and decoration, because all these are part of the world growth outside. We see less progress in such of the home industries as remain to us. It should be always held in mind that the phrase "domestic industry" does not apply to a special kind of work, but to a certain grade of work, a stage of development through which all kinds pass. All industries were once "domestic," that is, were performed at home and in the interests of the family. All industries have since that remote period risen to higher stages, except one or two which are still classed as "domestic," and rightly so, since they are the only industries on earth which have never left their primal stage. This a very large and important phase of the study of the home, and will be given due space later. Least of all do we see progress in the home ideas. The home has changed much in physical structure, in spite of itself. It has changed somewhat in its functions, also in spite of itself. But it has changed very little--painfully little--dangerously little, in its governing concepts. Naturally ideas change with facts, but if ideas are held to be sacred and immovable, the facts slide out from under and go on growing because they must, while the ideas lag further and further behind. We once held that the earth was flat. This was our concept and governed our actions. In time, owing to a widening field of action on the one hand, and a growth of the human brain on the other, we ascertained the fact that the earth was round. See the larger thought of Columbus driving him westward, while the governing concepts of the sailors, proving too strong for him, dragged him back. Then, gradually, with some difficulty, the idea followed the fact, and has since penetrated to all minds in civilised countries. But the flatness of the earth was not an essential religious concept, though it was clung to strongly by the inert religion of the time; nor was it a domestic concept, something still more inert. If it had been, it would have taken far longer to make the change.