Not long before the death of Smith, finding his end approach rapidly, he gave orders to destroy all his manuscripts, excepting some detached essays, which he entrusted to the care of his executors. With the exception of these essays, all his papers were committed to the flames. What were the particular contents of these papers was not known, even to his most intimate friends. The additions to the Theory of Moral Sentiments, most of which were composed under severe illness, had fortunately been sent to the press in the beginning of the preceding winter; and the author lived to see the publication of this new edition.[4] Some time before his last illness, when he had occasion to go to London, he enjoined his friends, to whom he had entrusted the disposal of his manuscripts, to destroy, in the event of his death, all the volumes of his lectures, doing with the rest what they pleased. When he had become weak, and saw the last period of his life approach, he spoke to his friends again upon the same subject. They entreated him to make his mind easy, as he might depend upon their fulfilling his desire. Though he then seemed to be satisfied, he, some days afterwards, begged that the volume might be immediately destroyed; which was accordingly done. Mr. Riddell, an intimate friend of Mr. Smith, mentions, that on one of these occasions he regretted he had done so little; 'but I meant,' he added, 'to have done more; and there are materials in my papers of which I could make a great deal.--But that is now out of the question.' That the idea of destroying such unfinished works as might be in his possession at the time of his death, was not the effect of any sudden or hasty resolution, appears from the following letter to Mr. Hume, written in 1773, at the time when he was preparing for a journey to London, with the prospect of a pretty long absence from Scotland. 'My dear friend,--As I have left the care of all my literary papers to you, I must tell you, that except those which I carry along with me, there are none worth the publication, but a fragment of a great work, which contains a history of the astronomical systems that were successively in fashion down to the time of Descartes. Whether that might not be published as a fragment of an intended juvenile work, I leave entirely to your judgment, though I begin to suspect myself, that there is more refinement than solidity in some parts of it. This little work you will find in a thin folio paper book in my back-room. All the other loose papers which you will find in that desk, or within the glass folding-doors of a bureau, which stands in my bed-room, together with about eighteen thin paper folio books, which you will likewise find within the same glass folding doors, I desire may be destroyed without any examination. Unless I die very suddenly, I shall take care that the papers I carry with me shall he carefully sent to you.'