especially recalling his insistence on the essential harmony between culture and reason. His numerous engagements impaired his strength, and in the autumn of 1868 he recruited on the continent, continuing the process next spring by a walking tour on the Scottish borders, and spending the following autumn in Italy. In May 1872 he was moderator of the United Presbyterian synod, and a few weeks later he officially represented his church in Paris at the first meeting of the Reformed Synod of France. On 16 May 1876 he was appointed joint professor of systematic theology and apologetics with James Harper [q. v.], principal of the United Presbyterian Theological College. On 18 June he preached a powerful and touching farewell sermon to an enormous congregation, thus severing his official connection with Berwick, where, however, he frequently preached afterwards.
In the spring of 1877, at the request of Bishop Laughton, Cairns lectured on Christianity in London in the interests of the Jews, and in April the Free Church, making the first exception in his case, appointed him its Cunningham lecturer. In the autumn he preached for some weeks at Christiania, responding to an invitation to check a threatened schism in the state church of Norway. He preached in Norsk, specially learned for the purpose. Next summer he was a fortnight in Paris, in connection with the M'All missions, and on the way formed one of a deputation of Scottish ministers who expressed sympathy with Mr. Gladstone in his attitude on the Bulgarian atrocities. While thus assisting elsewhere he worked hard at the United Presbyterian synod this same year in connection with the declaratory act of the church. Diversity of occupation and interest — even on occasion the learning of a new language — seemed indispensable for the exercise of his extraordinary energies and activities. On the death of Principal Harper he was appointed principal of the United Presbyterian Theological College, 8 May 1879. He delivered the Cunningham lecture in 1880, his subject being the unbelief of the eighteenth century. Five months of the same year he spent in an American tour, his personality and preaching everywhere making a deep impression. About the same time he was chairman of a committee of eminent protestant theologians, European and American, who discussed the possibility of formulating a common creed for the reformed churches.
In 1884, on the occasion of her tercentenary celebrations, Edinburgh University included Cairns among the distinguished Scotsmen on whom she conferred the honorary degree of LL.D. The death of a colleague in 1886 greatly increased his work, and yet about this time he completed a systematic study of Arabic, and between 1882 and 1886 he had learned Danish and Dutch, the former to qualify him for a meeting of the Evangelical Alliance at Copenhagen, and the latter to enable him to read Kuenen's theological works in the original. In May 1888 his portrait, by W. E. Lockhart, R.A., was presented to the synod by united presbyterian ministers and laymen. He spent some time of 1890 in Berlin and Amsterdam, mainly acquainting himself with the ways of younger theologians. On his return he wrote an elaborate article on current theology for the 'Presbyterian and Reformed Review.' In July 1891 he preached his last sermon in the church of his brother at Stitchel, near Kelso, and in the autumn of that year the doctors forbade further professional work. He resigned his post on 23 Feb. following, and he died at 10 Spence Street, Edinburgh, on 12 March 1892. He was buried in Echo Bank cemetery, Edinburgh, where a monument marks his grave.
Cairns never married, and from 1856 onwards his housekeeper was his sister Janet. His strength lay in the simple straight-forwardness of a manly character imbued with the traditions of a sturdy Scottish Christianity. His was a healthy, energetic, and practical evangelicalism, and his manner of proclaiming it appealed to all, from the unlettered peasant to the philosophical or theological specialist. The fact that all over Scotland, and by people of all denominations, he was familiarly and affectionately called 'Cairns of Berwick,' even after he was college principal, of itself marks a deep and unique influence. Had he not been a distinguished divine he might have achieved fame as a philosophical writer. From his criticism of Ferrier's 'Metaphysics' and the cognate discussion he earned the reputation of being a prominent though independent Hamiltonian (Masson, Recent British Philosophy, pp. 265-6).
Besides numerous articles in church magazines. Cairns published: 1. 'Translation of Krummacher's "Elijah the Tishbite,"' 1846. 2. 'Fragments of College and Pastoral Life: a Memoir of Rev. John Clark,' 1851. 3. 'Examination of Ferrier's "Knowing and Being" and "The Scottish Pliilosophy: a Vindication and a Reply,"' 1856. 4. 'Memoir of John Brown, D.D.,' 1860. 5. 'Liberty of the Christian Church' and 'Oxford Rationalism,' 1861. 6. 'Romanism and Rationalism,' 1863. 7. 'False Christs and the True,' 1864, considered by Dean Milman the best
