That invention and progress have produced and may be relied upon to continue to produce prosperity, may reasonably be predicted. But will they together produce happiness? The author respectfully begs to be excused from answering this question. He requests attention, however, to the manifest facts that invention is a natural gift, that the impetus to invention has always been the desire to achieve prosperity of some kind, and that to employ our natural gifts to satisfy our natural instincts can reasonably be expected to further our happiness; unless, indeed, we suspect Nature of playing tricks upon us. That Nature sometimes seems to do this, and that it is dangerous to follow our instincts blindly is of course a fact. But it seems to be a fact also that the danger in following our instincts seems to come only when we follow them blindly; and that, though there may be danger sometimes in following them even under the guidance of our reason, yet the only way in which we have ever progressed at all has been by following our instincts under reason's guidance, and invention's inspiration. And since the civilized world is in virtual agreement that civilization is a happier state than savagery, and since we have been impelled toward civilization by invention mainly, there seems no escape from the conclusion that it is to invention mainly that we must look for increase of happiness in the future. It may be, of course, that happiness does not come so much from a condition or state attained as from the act of striving to attain it. It may be suggested also by some one that life is merely a game, and that happiness comes from playing the game and not from winning it, just as children delight more in constructing a toy building with their blocks than in the building when completed: for they no sooner complete the building than they knock it down, and begin to build it up again. But, even from this point of view, the desirability of fostering invention would be apparent; because it would continually supply us with new games to play, and new toys with which to play them.