The author here requests any possible reader of these pages, not to infer that he has any objection to being pleased himself, or to having others pleased; or that he regards the influence of literature and the fine arts as being detrimental to the race. On the contrary, he regards them as being valuable in the highest degree. He is merely trying to point out the difference between the influence of inventions in the useful arts and those in the fine arts. A like remark may be made concerning inventors and other men; the word inventors being here supposed to mean the men who make inventions of all kinds. These men seem to have been those who have brought into existence those machines and books and projects of all kinds that have determined the kind of machine of civilization that has now been produced. These men are very few, compared with the great bulk of humanity; but it seems to be they who have given direction to the line along which the machine has been developed. This does not mean, of course, that these men have been more estimable themselves than the men who kept the machine in smooth and regular motion, and made the repairs, and supplied the oil and fuel; but it does mean that they had more influence in making its improvements. Naturally, their work in making improvements would have been of no avail, if other men had not exerted industry and carefulness and intelligence and courage, in the countless tasks entailed in maintaining the machine in good repair, in keeping it running smoothly, and in receiving with open minds and helping hands each new improvement as it came along. And it was not only in welcoming real improvements, but in keeping out novelties which seemed to be improvements but were not improvements that the work of what may be called the operators, as distinguished from the inventors, was beneficent. Nothing could be more injurious to the machine than to permit the incorporation in it of parts that would not improve it. There has been little danger to fear from this source, however; for the inertia of men is such that it is only rarely that one sees any new device accepted, until it has proved its value definitely and unmistakably in practical work.