I was appointed secretary to the embassy; and in summer, 1765, Lord Hertford left me, being appointed Lord Lieutenant of Ireland. I was chargé d'affaires till the arrival of the Duke of Richmond, towards the end of the year. In the beginning of 1766 I left Paris, and next summer went to Edinburgh, with the same view as formerly of burying myself in a philosophical retreat. I returned to that place, not richer, but with much more money, and a much larger income, by means of Lord Hertford's friendship, than I left it; and I was desirous of trying what superfluity could produce, as I had formerly made an experiment of a competency. But in 1767 I received from Mr. Conway an invitation to be under-secretary; and this invitation, both the character of the person, and my connexions with Lord Hertford, prevented me from declining. I returned to Edinburgh in 1769, very opulent, (for I possessed a revenue of 1000L. a year,) healthy, and, though somewhat stricken in years, with the prospect of enjoying long my ease, and of seeing the increase of my reputation. In spring, 1775, I was struck with a disorder in my bowels, which at first gave me no alarm, but has since, as I apprehend it, become mortal and incurable. I now reckon upon a speedy dissolution. I have suffered very little pain from my disorder; and what is more strange have, notwithstanding the great decline of my person, never suffered a moment's abatement of my spirits, inasmuch that were I to name a period of my life which I should most choose to pass over again, I might be tempted to point to this later period. I possess the same ardour as ever in study, and the same gaiety in company. I consider, besides, that a man of sixty-five, by dying, cuts off only a few years of infirmities; and though I see many symptoms of my literary reputation's breaking out at last with additional lustre, I know that I could have but few years to enjoy it. It is difficult to be more detached from life than I am at present.