This two-handed Roman Diary, that of the great art historian and that of his collaborator, bears witness to the first public presentation of the Atlas Mnemosyne at the still unpublished lecture by Warburg at the Hertzian Library. The great project of the Atlas, which was to be interrupted by Warburg's death on October 26, 1929, proposes a method of analysis that currently constitutes the necessary starting point for any study of the image. Furthermore, the Journal reflects the cultural and political microcosm in which Aby Warburg and Gertrud Bing worked in decisive years both for their research and for Italian culture. Rome and its world is the object of dialogue between the two, of judgments and critical evaluations, mixed with the daily routine of life itself, which makes this Journal an essential text for anyone who wishes to approach the fascinating and enigmatic personality of the founder of iconology, which, far from the prevailing aestheticism among art historians, guided its work guided by the history of religions and psychology.