Reid was fortunate in entering Marischal College when it was inspired by M’Laurin, Blackwell, and Turnbull, each a leader in the scientific and literary awakening of the time. The Aberdeen of 1725 was no longer the Aberdeen of the ministers of whom Gordon in his _Scots Affairs_ tells that they shrieked, ‘downe with learning and up with Christ.’ Their religion was in alliance with culture and progressive intelligence, anticipating in the North the intellectual enlargement associated in the West with the University of Glasgow under Hutcheson, Leechman, and Adam Smith. George Turnbull is little known now, but he is too important a factor in the making of Thomas Reid to be lightly passed over. He was an Edinburgh graduate, born in 1698, and like Reid a son of the manse. He became a regent of philosophy in Marischal College at the age of twenty-three. The College record informs us that on the 14th of April 1726 he presented for graduation a band of thirty-nine students: the name of Thomas Reid appears last in the list. Turnbull’s lectures when he was regent were in 1740 embodied in his _Principles of Moral Philosophy_. His leading arguments are illustrated and vindicated by quotations from Berkeley’s _Theory of Vision_ and _Principles of Human Knowledge_, also by the _Inquiry_ of Francis Hutcheson and the _Sermons_ of Bishop Butler. The influence of Berkeley is evident. 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.