I shall here try to go more at large into this subject, and to give such instances and illustrations of it as occur to me. One of the persons who had rendered themselves obnoxious to Government, and been included in a charge for high treason in the year 1794, had retired soon after into Wales to write an epic poem and enjoy the luxuries of a rural life. In his peregrinations through that beautiful scenery, he had arrived one fine morning at the inn at Llangollen, in the romantic valley of that name. He had ordered his breakfast, and was sitting at the window in all the dalliance of expectation, when a face passed of which he took no notice at the instant—but when his breakfast was brought in presently after, he found his appetite for it gone, the day had lost its freshness in his eye, he was uneasy and spiritless; and without any cause that he could discover, a total change had taken place in his feelings. While he was trying to account for this odd circumstance, the same face passed again—it was the face of Taylor the spy; and he was no longer at a loss to explain the difficulty. He had before caught only a transient glimpse, a passing side-view of the face; but though this was not sufficient to awaken a distinct idea in his memory, his feelings, quicker and surer, had taken the alarm; a string had been touched that gave a jar to his whole frame, and would not let him rest, though he could not at all tell what was the matter with him. To the flitting, shadowy, half-distinguished profile that had glided by his window was linked unconsciously and mysteriously, but inseparably, the impression of the trains that had been laid for him by this person;—in this brief moment, in this dim, illegible short-hand of the mind he had just escaped the speeches of the Attorney and Solicitor-General over again; the gaunt figure of Mr. Pitt glared by him; the walls of a prison enclosed him; and he felt the hands of the executioner near him, without knowing it till the tremor and disorder of his nerves gave information to his reasoning faculties that all was not well within. That is, the same state of mind was recalled by one circumstance in the series of association that had been produced by the whole set of circumstances at the time, though the manner in which this was done was not immediately perceptible. In other words, the feeling of pleasure or pain, of good or evil, is revived, and acts instantaneously upon the mind, before we have time to recollect the precise objects which have originally given birth to it.[16] The incident here mentioned was merely, then, one case of what the learned understand by the _association of ideas_: but all that is meant by feeling or common sense is nothing but the different cases of the association of ideas, more or less true to the impression of the original circumstances, as reason begins with the more formal developement of those circumstances, or pretends to account for the different cases of the association of ideas.