The English edition of this work, which I now give to the public, differs in many respects from the French edition. Several new chapters have been added, and important alterations and amplifications made. I have enlarged considerably on the personal role of Columbus in the fraud I seek to unveil, and the portion of the work bearing on the map has been both recast and extended. This part has been further completed by a new table for the understanding of the measurements attributed to Toscanelli in a form at once clearer and more detailed, and by a hypothetical restoration of the famous map which is supposed to have played so famous a part in the scheme which led to the discovery of America. The notes have also been increased and amended, while a great number of entirely new ones, including some of the most important, have been added.<br><br>Finally, additional Appendices accompany the work.