“But,” you say, “it is this very division of labor, the freeing men of science and of art from the necessity of earning their bread, that has rendered possible the extraordinary success in science which we see to-day. “If everybody were to plow, these enormous results would not be attained; you would not have those astonishing successes which have so enlarged man's power over nature; you would not have those discoveries in astronomy which so strike the minds of men and promote navigation; there would be no steamers, railways, wonderful bridges, tunnels, steam-engines, telegraphs, photographs, telephones, sewing-machines, phonographs, electricity, telescopes, spectroscopes, microscopes, chloroform, Lister bandages, carbolic acid.” I will not attempt to enumerate all the things of which our century is proud. This enumeration, and the ecstasy of the contemplation of ourselves and of our great deeds you can find in almost every newspaper a...