These two authors had just undertaken the 'Dictionnaire Encyclopedique', which at first was intended to be nothing more than a kind of translation of Chambers, something like that of the Medical Dictionary of James, which Diderot had just finished. Diderot was desirous I should do something in this second undertaking, and proposed to me the musical part, which I accepted. This I executed in great haste, and consequently very ill, in the three months he had given me, as well as all the authors who were engaged in the work. But I was the only person in readiness at the time prescribed. I gave him my manuscript, which I had copied by a laquais, belonging to M. de Francueil of the name of Dupont, who wrote very well. I paid him ten crowns out of my own pocket, and these have never been reimbursed me. Diderot had promised me a retribution on the part of the booksellers, of which he has never since spoken to me nor I to him. This undertaking of the 'Encyclopedie' was interrupted by his imprisonment. The 'Pensees Philosophiquiest' drew upon him some temporary inconvenience which had no disagreeable consequences. He did not come off so easily on account of the 'Lettre sur les Aveugles', --[Letter concerning blind persons.]--in which there was nothing reprehensible, but some personal attacks with which Madam du Pre St. Maur, and M. de Raumur were displeased: for this he was confined in the dungeon of Vincennes. Nothing can describe the anguish I felt on account of the misfortunes of my friend. My wretched imagination, which always sees everything in the worst light, was terrified. I imagined him to be confined for the remainder of his life. I was almost distracted with the thought. I wrote to Madam de Pompadour, beseeching her to release him or obtain an order to shut me up in the same dungeon. I received no answer to my letter: this was too reasonable to be efficacious, and I do not flatter myself that it contributed to the alleviation which, some time afterwards, was granted to the severities of the confinement of poor Diderot. Had this continued for any length of time with the same rigor, I verily believe I should have died in despair at the foot of the hated dungeon. However, if my letter produced but little effect, I did not on account of it attribute to myself much merit, for I mentioned it but to very few people, and never to Diderot himself.