But we must not neglect to observe two significant passages. One of them is the recognition of the part that invention might play in the ideal commonwealth. The people of the City of the Sun have wagons that are driven by the wind, and boats “which go over the waters without rowers or the force of the wind, but by a marvelous contrivance.” There is a very clear anticipation of the mechanical improvements which began to multiply so rapidly in the eighteenth century. At the tale end of the sea-captain’s recital, the Grand Master exclaims: “Oh, if you knew what our astrologers say of the coming age, that has in it more history within a hundred years than all the world had in four thousand years before! Of the wonderful invention of printing and guns, and the use of the magnet....” With the mechanical arts in full development, labor in the City of the Sun has become dignified: it is not the custom to keep slaves. Since everyone takes his part in the common work, there is not more than four hours’ work to be done per day. “They are rich because they want nothing; poor because they possess nothing; and consequently they are not slaves to circumstances, but circumstances serve them.” The other point upon which Campanella’s observation is remarkably keen is his explanation of the relation of private property and the private household to the commonwealth. Thus: “They say that all private property is acquired and improved for the reason that each one of us by himself has his own home and wife and children. From this self-love springs. For when we raise a son to riches and dignities, and leave an heir to much wealth, we become either ready to grasp at the property of the state, if in any case fear should be removed from the power which belongs to riches and rank; or avaricious, crafty, and hypocritical, if any is of slender purse, little strength, and mean ancestry. But when we have taken away self-love, there remains only love for the state.” How shall the common Utopia keep from being neglected through each one’s concern for his little private utopia?