In youth, as an undergraduate, Johnstone was sallow, but healthy, rather lean and light, with a large and well-moulded musician's head, like Beethoven's or, still more, Rubinstein's, in the outline of the overhanging brow. It is easy to recall that earnest face, that delightful smile always characteristic of him, and, above all, the fascination of his playing on the piano. His voice was clear and carried well, with a sharp metallic ring when he was indignant, but was usually pitched low, as if unwilling to be overheard. His manner was formed and his talk was from the first what it remained: forcible, emphatic, and undoubtedly over-superlative at times, cut into quaintly elaborate but perfectly built sentences, which came so naturally to him that we have heard him discharge one of them the moment after opening his eyes in the morning. They can best be illustrated by his more familiar style in his writings and letters; the latter, indeed, give a fairly exact reflex of his talk. A _flâneur_ of the best kind, he observed closely and curiously; in spite of long spells of apparent idleness, the alert quality of his mind never showed the faintest trace of slackness. He described vividly and accurately; and he had a remarkable gift for explaining any subject or point of view unfamiliar to his listeners, careful that the slightest detail should not escape them. And, in turn, he would quickly catch up and develop the ideas of his friends however vaguely suggested or insufficiently thought out. Johnstone professed Radical principles and was a member of the Russell Club, where the advanced Liberals met for papers and debates; but his Radicalism was social rather than political, and after the foreign experiences of his later years his opinions tended in the direction of strong government and Imperialism. At this time it amused him to be rather eccentric in dress, though he afterward became trim and fairly modish. In 1882 the intellectual undergraduate was capable of wearing a wide-brimmed, light-brown, hard hat, descending over the ears and eyes and long hair penthouse fashion. He had one of these "built for me, ground plan and projection" on a special scale. He also had a tie which could be folded into twenty-five different aspects or patterns, some of them striking; it was a mosaic of squares, and the harvest of a long search; twenty-five neckties in one. His collars were ultra-Byronic. Otherwise he was not markedly strange in attire; though the real incongruity was between these freaks of dress, and the keen intent grey gleam of his eyes, and the look of held-in vehemence and sensibility.