For forty years after Reid’s death the higher thought of Scotland, represented by its leaders, remained well within the old lines. It was still careful analysis of what is presented in human consciousness, with a gradual decline of interest in the metaphysical and moral problems which Hume’s agnostic distrust had introduced even into Reid’s modest treatment of the common sense. Scottish philosophy became a search for natural sequences and co-existences among phenomena, instead of search for firm intellectual and moral footing in a universe to which we are introduced by being percipient of an infinitesimal part through our five senses. For a quarter of a century Dugald Stewart was Reid’s acknowledged successor, less original, and even less adventurous, than his master, but unrecognisable in the ill-tempered criticism of Schopenhauer. With dignified eloquence, wider intimacy with society than Reid’s, and more learning, he applied inductive methods to find the laws that determine intellectual character and the education of the human mind, also to solve social questions, in graceful language—all which touched the popular imagination more than his somewhat prosaic predecessor. * * * * * Early in the nineteenth century, Thomas Brown, the young Edinburgh Professor of Moral Philosophy, and colleague of Stewart, raised a revolt against Reid and Stewart in some of their characteristic philosophy. This brilliant youth, minor poet as well as philosopher, had practised medicine in Edinburgh before his appointment, in 1810, at the age of thirty-two, to the chair of Stewart. In medical practice he had been the colleague of Dr. Gregory, Reid’s cousin, and so long his correspondent. Brown, unlike Reid, was one of the precocious philosophers. At the age of twenty he appeared as a critic of the _Zoonomia_ of Darwin, and a few years later as author of an _Inquiry into the Relation of Cause and Effect_, which contains the essence of the philosophy that was afterwards expanded and applied in his _Lectures_. He died at the age of forty-two, leaving works undistinguished by the deep and patient thought of Reid, and diffuse in style, but abounding in ingenious analysis—an interesting contribution to the logic of physical inquiry, instead of appeals to carefully considered judgments of the Common Sense in Perception and in Causation. Brown recognised instinctive belief in natural constancies of co-existence and sequence among phenomena, and treated associations among mental states as the chief explanation of the phenomena of mind. The originative moral agency of intending and intelligent Will, so prominent latterly in Reid, disappears in Brown. And Brown, like Priestley, disparaged Reid’s claim to merit for reversing the philosophical prejudice that ‘ideas’ are the only objects of human cognition, regarding it as a metaphor mistaken for a dogma. Indeed, the empirical laws of