For three years Napoleon's self-appointed task as a historian was unremittingly pursued, and the results, while he had the assistance of Las Cases and Gourgaud, were voluminous; thereafter the output was a slender rill. Most of the volumes which record his observations and opinions bear the names of the respective memorialists, Montholon, Las Cases, Gourgaud, O'Meara, and Antommarchi, the two latter his attendant physicians. The period he took pains to elucidate most fully in these writings was that between Toulon and Marengo. Over his own name appeared monographs on Elba, the Hundred Days, and Waterloo. His professional ability is shown by short studies on the "Art and History of War," on "Army Organization," and on "Fortification"; likewise by his full analyses of the wars waged by Caesar, Turenne, and Frederick the Great. These are not unworthy of the author's reputation; his versatility is displayed in a few commonplace notes--some on Voltaire's "Mahomet," some on suicide, and others on the second book of the AEneid. A widely circulated treatise, the "Manuscript from St. Helena," was long attributed to him, but was a clever forgery. As will be explained, its effect on history was important. For nearly four years Napoleon's health was fair. O'Meara, the physician appointed to attend him, was assiduous and skilful, but when he became his patient's devoted slave he was dismissed by Lowe. Thereupon certain disquieting symptoms, which had been noted from time to time, became more pronounced, and the prisoner began to brood and mope in seclusion. In the autumn of 1819, Dr. Antommarchi, a Corsican physician chosen by Fesch, was installed at Longwood. For a time, as he claimed, he had some success in ameliorating the ex-Emperor's condition, and to what the writer records as their confidential talks we owe our knowledge of Napoleon's infancy. But from month to month the patient's strength diminished, and the ravages of his mysterious disease at length became very apparent. The obstinacy of Lowe in carrying out the letter of his instructions, by intruding on the sufferer to secure material for a daily report, seriously aggravated Napoleon's miseries. Two priests accompanied Antommarchi: one only remained for some time, and after his arrival mass was celebrated almost every morning in the chapel adjoining the sick-room. "Not every man is an atheist who would like to be," was a remark Napoleon dropped to Montholon. Yet, though preparing for death, he was making ready simultaneously to speed his Parthian arrow.