Cairns entered the Hall, at that time meeting in Glasgow, in the August of 1840. Of the four professors who were on the staff of the institution, and all of whom were capable men, only two need here be mentioned. These were Dr. Robert Balmer of Berwick and Dr. John Brown of Edinburgh. Dr. Balmer was a clear-headed, fair-minded theologian--in fact, so very fair, and even generous, was he wont to be in dealing with opponents that he sometimes, quite unjustly, incurred the suspicion of being in sympathy, if not in league, with these opponents. He is specially interesting to us in this place, because Cairns succeeded him first in his pulpit, and then, after a long interval, in his chair. Dr. Brown, the grandson and namesake of the old commentator of Haddington, was a man of noble presence and noble character, whose personality "embedded in the translucent amber of his son's famous sketch" is familiarly known to all lovers of English literature. He was the pioneer of the scientific exposition of the Scriptures in the Scottish pulpit, and was one of the first exegetical theologians of his time. His point of view may be seen in a frequent criticism of his on a student's discourse: "That is truth and very important truth, but it is not _the_ truth that is taught in this passage." Being so, it was simply "matter in the wrong place," _dirt_ to be cleared away as speedily as possible. Cairns had been first attracted to Dr. Brown by his speeches on the Annuity Tax, an Edinburgh ecclesiastical impost for which he had suffered the spoiling of his goods, and he had been for more than a year a member of his church in Broughton Place; but it was only now that he came to know him really well. Henceforth his admiration for Dr. Brown, and the friendship to which Dr. Brown admitted him, were to be amongst the most powerful influences of his life. Among his fellow-students at the Hall were several young men of brilliant promise, such as John Ker, who had been first prizeman in the Logic class in Hamilton's first session, W.B. Robertson, Alexander MacEwen, Joseph Leckie, and William Graham. Of these, Graham, bright, witty, versatile, the most notorious of punsters and the most illegible of writers, was his chief intimate, and their friendship continued unbroken and close for half a century.