_PUBLICATION OF THE “DIALOGUES ON THE TWO PRINCIPAL SYSTEMS OF THE WORLD,” AND TRIAL AND CONDEMNATION OF GALILEO._ CHAPTER I. _THE “DIALOGUES” ON THE TWO SYSTEMS._ Origin of the “Dialogues.”—Their Popular Style.—Significance of the name Simplicius.—Hypothetical treatment of the Copernican System.—Attitude of Rome towards Science.—Thomas Campanella.—Urban VIII.’s Duplicity.—Galileo takes his MS. to Rome.—Riccardi’s Corrections—He gives the _Imprimatur_ on certain Conditions.—Galileo returns to Florence to complete the Work. It is a curious fact that the very work which was destined to be one of the most powerful levers in obtaining general recognition for the true order of the universe originated in what we now know to be an erroneous idea. The famous book, “Dialogues on the Two Principal Systems of the World, the Ptolemaic and Copernican,”[211] arose out of the treatise on the tides which Galileo wrote at Rome, in 1616, at the suggestion of Cardinal Orsini.[212] The important influence of these “Dialogues,” both on science and the subsequent fate of the author, obliges us to discuss them more particularly. The book contains a great deal more than is promised by the title; for the author included in it, in connection with the discussion of the two systems, nearly all the results of his researches and discoveries in science, extending over nearly fifty years. He also endeavoured to write in a style which should be adapted not for the learned world alone, but which would be both intelligible and attractive to every educated person; and in this he attained complete success, for he wished by means of this book to extend as widely as possible a knowledge of the true order of nature. The form of the work was most happily chosen. The results of the researches of a lifetime were not given to the reader in a work redolent of the pedantry of the professor’s chair, in which scientific demonstrations drag on with wearisome monotony, but in the lively form of dialogue, which admitted of digressions and gave the author scope for displaying his seductive eloquence, his rare skill in dialectics and biting sarcasm—in short, for his peculiarly brilliant style.