The key-note of preparation, the claim which preëminently should be set forth in advance, is this: that De Quincey was the prince of hierophants, or of pontifical hierarchs, as regards all those profound mysteries which from the beginning have swayed the human heart, sometimes through the light of angelic smiles lifting it upwards to an altitude just beneath the heavens, and sometimes shattering it, with the shock of quaking anguish, down to earth. As it was the function of the hierophant, in the Grecian mysteries, to show the sacred symbols as concrete incarnations of faith, so was it De Quincey's to reveal in open light the everlasting symbols, universally intelligible when once disclosed, which are folded in the involutions of dreams and of those meditations which most resemble dreams; and as to the manner of these revelations, no Roman _pontifex maximus_, were it even Cæsar himself, could have rivalled their magisterial pomp. The peculiarities of his life all point in the direction here indicated. It was his remarkable experience which furnished him the key to certain secret recesses of human nature hitherto sealed up in darkness. Along that border-line by which the glimmerings of consciousness are, as by the thinnest, yet the most impervious veil, separated from the regions of the unexplored and the undefinable, De Quincey walked familiarly and with privileged eye and ear. Many a nebulous mass of hieroglyphically inscribed meanings did he--this Champollion, defying all human enigmas, this Herschel, or Lord Rosse, forever peering into the obscure chasms and yawning abysses of human astronomy--resolve into orderly constellations, that, once and for all, through his telescopic interpretation and enlargement, were rendered distinct and commensurable amongst men. The conditions of his power in this respect are psychologically inseparable from the remarkable conditions of his life, two of which are especially to be noticed. First, a ruling disposition towards meditation, constituting him, in the highest sense of the word, a poet. Secondly, the peculiar qualities which this singular mental constitution derived from his use of opium,--qualities which, although they did not increase, or even give direction to his meditative power, at least magnified it, both optically, as to its visual capacity, and creatively, as to its constructive faculty. These two conditions, each concurrent with the other in its ruling influence, impart to his life a degree of psychological interest which belongs to no other on record. Nor is this all. The reader knows how often a secondary interest will attach to the mightiest of conquerors or to the wisest of sovereigns, who is not merely in himself, and through his own deeds, magnificent, but whose glory is many times repeated and piled up by numerous reverberations of itself from a contemporary race of Titans. Thus, doubtless, Charles V., although himself King of Spain, Germany, the