The mottoes on the title-page of Turnbull’s book express his method of inquiry. One of them is the precept of Pope—‘Account for moral as for natural things’; the other expresses in the words of Newton the consequence which may be expected to follow—‘If Natural Philosophy, in all its parts, by pursuing this method, shall at length be perfected, the bounds of Moral Philosophy will also be enlarged.’ Turnbull was among the first in Scotland to substitute, in mental philosophy, tentative study of the facts of human nature for logical deduction from abstract dogmas. ‘If a fact be actually found, either in the outer world of sensible things, or in the inner and invisible world of mind, there is no room for reasoning against it. Every reasoning, however subtle, if it be repugnant in its conclusion to the actual fact of the case, must be sophistical.’ Turnbull is fond of repeating that facts presented to the senses are not the only, nor yet the most important, facts which the universe contains. The invisible facts which take the form of beliefs and feelings and volitions are the deepest facts of all: spirit and not matter at last regulates life. Then he refers to what he calls ‘common sense’ as the final arbiter in all questions. ‘Common sense is sufficient to teach those who think of the matter with seriousness and attention all the duties of common life; all our obligations to God and our fellow-men; all that is morally fit and binding.’ In a word, spiritual facts of mind are not to be crushed out of existence by tangible and visible facts of matter. That mind in the form of will is the only known active power is another prominent lesson in Turnbull’s teaching. ‘It is will alone that manifests power or productive energy. To speak of any other active power in the universe is to speak without meaning; because experience, the source of all the materials of our knowledge, does not lead us to any other conception of power.’ Turnbull’s conception of the material world is very like Berkeley’s. Matter is the established or natural order in which sense ideas present themselves. ‘Properly speaking, what we call matter and space are only sensible ideas, produced in us, according to an established or natural order, by some external cause; for when we speak of material things, we can only mean certain sensible perceptions that arise in our minds, according to a fixed order, but which are experienced to be absolutely inert or passive, having in themselves no productive force.’ It was in this philosophy that Turnbull’s most famous pupil was educated at Marischal College.
Turnbull’s official connection with the College lasted only six years. After inaugurating moral philosophy in the modern spirit in Scotland, he resigned in the spring of 1727, and, after some residence abroad, lived in London, producing books in excess of the demand for them. He ended by taking orders in the Irish branch of the Anglican Church, finding the communion of Jeremy Taylor and Berkeley more suited to his temper than the fervid Presbyterianism to which he was accustomed in his youth. In search of health, he died at the Hague in 1749.
I have enlarged on Turnbull, because by him Reid was first attracted to the study of the human mind. But Blackwell, the Professor of Greek, must not be forgotten. Blackwell, as well as Turnbull, was connected with Berkeley. It was when Reid was at Marischal College that Berkeley was engaged in the most romantic missionary enterprise of that age, for spreading Christian civilisation in America by a College in the Bermudas. Curiously, Blackwell was one of those whom he asked to join the little party of missionaries who embarked with him at Gravesend in September 1728, after he had surrendered high preferment in Ireland in order to devote his life to a more cosmopolitan philanthropy. The Aberdeen regent was not prepared for the sacrifice. He refers thus to Berkeley’s adventure:—
‘In this respect I would with pleasure do justice to the memory of a very great though singular sort of man, known as a philosopher, and intended founder of a University in the Bermudas or Summer Islands. An inclination to carry me out with him on that expedition, as one of the young professors on his new foundation, having brought us often together, I scarce remember to have conversed with him on that art, liberal or mechanic, of which he knew not more than the ordinary practitioners. With the widest views, he descended to the most minute detail, and begrudged neither pains nor expense for the means of information. I enter not into his peculiarities, either religious or personal, but admire the extensive genius of the man, and think it a loss to the Western world that his noble and exalted plan of an American University was not carried into execution.’—Memoirs of the Court of Augustus.
The fact that Berkeley was so much in evidence at Marischal College in those days, through Turnbull and Blackwell, is significant of much in the life of Reid.
If Reid recorded his thoughts when he was a student at Marischal College, the record has been lost. A commonplace book like Berkeley’s, when Berkeley was an undergraduate in Dublin, would have cast welcome light on this part of his mental history. The only extant revelation of his inner life in these years is contained in a letter written half a century after to his kinsman William Gregory at Oxford. It relates to the period when his year was divided between town and country—the winters at Aberdeen and the long summer days at the manse of Strachan:—
‘About the age of fourteen I was,’ he says, ‘almost every night unhappy in my sleep from frightful dreams: sometimes hanging over a dreadful precipice, and just ready to drop down; sometimes pursued for my life and stopped by a wall, or by a sudden loss of strength; sometimes ready to be devoured by a wild beast. How long I was plagued with such dreams I do not recollect. I believe it was for a year or two at least; and I think they had left me before I was fifteen. In those days I was much given to what Mr. Addison in one of his “Spectators” calls castle-building; and in my evening solitary walk (which was generally all the exercise I took), my thoughts would hurry me into some active scene, where I generally acquitted myself much to my own satisfaction, and in those scenes of imagination I performed many a gallant exploit. At the same time, in my dreams I found myself the most arrant coward. Not only my courage but my strength failed me in every danger; and I often rose from my bed in the morning in such a panic that it took some time to get the better of it. I wished much to get free of these uneasy dreams, which not only made me unhappy in sleep, but left a disagreeable impression on my mind for some part of the following day. I thought it was worth trying whether it was possible to recollect while I was dreaming that it was all a dream, and that I was in no danger. Accordingly, I often went to sleep with my mind as strongly impressed as I could with this thought—that I never in my lifetime had been in any real danger, and that every fright I had was a dream. After many fruitless endeavours to recollect this when the danger appeared, I effected it at last, and have often, when I was sliding down a precipice into the abyss, recollected that it was all a dream, and boldly jumped down. The effect of this commonly was that I immediately awoke; but I awoke calm and intrepid, which I thought a great acquisition. After this my dreams were never very uneasy; and in a short time I dreamed not at all. During all this time I was in perfect health; but whether my ceasing to dream was the effect of the recollection above mentioned, or of any change in the habit of my body, which is usual about that period of life, I cannot tell. I think it may more probably be imputed to the last. However, the fact was that for at least forty years after I dreamt none, to the best of my remembrance; and finding from the testimony of others that this is somewhat uncommon, I have often as I awoke endeavoured to recollect, without being able to recollect anything that passed in my sleep. The only distinct dream I ever had since I was about sixteen, as far as I remember, was about two years ago (1777). I had got my head blistered for a fall. A plaster which was put upon it after the blister pained me excessively for a whole night. In the morning I slept a little, and dreamed very distinctly that I had fallen into the hands of a party of Indians and was scalped. I am apt to think that, as there is a state of sleep and a state wherein we are awake, so there is an intermediate state which partakes of the other two. I have slept on horseback, but so as to preserve my balance; and if the horse stumbled, I could make the exertion necessary to save me from a fall, as if I was awake.’
In all this one detects the disposition to sober introspection, which ripened as life advanced.