During the remaining period of his life, he appears to have done little more than to discharge, with peculiar exactness, the duties of his office, which, though they required no great exertion, were sufficient to divert his attention from his studies. He very early felt the infirmities of old age, but his health and strength were not greatly affected till he was left alone, by the death of his mother, in 1784, and of his cousin four years after. They had been the objects of his affection for more than sixty years; and in their society he had enjoyed, from his infancy, all that he ever knew of the endearments of a family. In return for the anxious and watchful solicitude of his mother during infancy, he had the singular good fortune of being able to show his gratitude to her during a very long life; and it was often observed, that the nearest avenue to his heart was through his mother. He now gradually declined till the period of his death, which happened in 1790. His last illness, which arose from a chronic obstruction in the bowels, was lingering and painful; but he had every consolation to soothe it which he could desire, from the tenderest sympathy of his friends, and from the completest resignation of his own mind. His friends had been in use to sup with him every Sunday. The last time he received them, which was a few days before his death, there was a pretty numerous meeting; but not being able to sit up as usual, he retired to bed before supper. On going away, he took leave of the company, by saying, 'I believe we must adjourn this meeting to some other place.' In a letter addressed, in the year 1787, to the principal of the university of Glasgow, in consequence of his being elected rector of that learned body, a pleasing memorial remains of the satisfaction with which he always recollected that period of his literary career, which had been more peculiarly consecrated to his academical studies. On that occasion he writes:-- 'No preferment could have given me so much real satisfaction. No man can owe greater obligations to a society than I do to the university of Glasgow. They educated me; they sent me to Oxford. Soon after my return to Scotland, they elected me one of their own members, and afterwards preferred me to another office, to which the abilities and virtues of the never-to-be-forgotten Dr. Hutcheson had given a superior degree of illustration. The period of thirteen years, which I spent as a member of that society, I remember as by far the most useful, and therefore, as by far the happiest and most honourable period of my life; and now, after three-and-twenty years absence, to be remembered in so very agreeable a manner by my old friends and protectors, gives me a heart-felt joy which I cannot easily express to you.'