—magnam mihi mentem, animumque Delius inspiret Vates.

It is on the same principle of predisposing the mind, that many have first generated their feelings by the symphonies of music. ALFIERI often before he wrote prepared his mind by listening to music: "Almost all my tragedies were sketched in my mind either in the act of hearing music, or a few hours after"—a circumstance which has been recorded of many others. Lord BACON had music often played in the room adjoining his study: MILTON listened to his organ for his solemn inspiration, and music was even necessary to WARBURTON. The symphonies which awoke in the poet sublime emotions, might have composed the inventive mind of the great critic in the visions of his theoretical mysteries. A celebrated French preacher, Bourdaloue or Massillon, was once found playing on a violin, to screw his mind up to the pitch, preparatory for his sermon, which within a short interval he was to preach before the court. CURRAN'S favourite mode of meditation was with his violin in his hand; for hours together would he forget himself, running voluntaries over the strings, while his imagination in collecting its tones was opening all his faculties for the coming emergency at the bar. When LEONARDO DA VINCI was painting his "Lisa," commonly called La Joconde, he had musicians constantly in waiting, whose light harmonies, by their associations, inspired feelings of

Tipsy dance and revelry.

There are slight habits which may be contracted by genius, which assist the action of the mind; but these are of a nature so trivial, that they seem ridiculous when they have not been experienced: but the imaginative race exist by the acts of imagination. HAYDN would never sit down to compose without being in full dress, with his great diamond ring, and the finest paper to write down his musical compositions. ROUSSEAU has told us, when occupied by his celebrated romance, of the influence of the rose-coloured knots of ribbon which tied his portfolio, his fine paper, his brilliant ink, and his gold sand. Similar facts are related of many. Whenever APOSTOLO ZENO, the predecessor of Metastasio, prepared himself to compose a new drama, he used to say to himself, "Apostolo! recordati che questa è la prima opera che dai in luce."—"Apostolo! remember that this is the first opera you are presenting to the public." We are scarcely aware how we may govern our thoughts by means of our sensations: DE LUC was subject to violent bursts of passion; but he calmed the interior tumult by the artifice of filling his mouth with sweets and comfits. When GOLDONI found his sleep disturbed by the obtrusive ideas still floating from the studies of the day, he contrived to lull himself to rest by conning in his mind a vocabulary of the Venetian dialect, translating some word into Tuscan and French; which being a very uninteresting occupation, at the third or fourth version this recipe never failed. This was an art of withdrawing attention from the greater to the less emotion; by which, as the interest weakened, the excitement ceased. MENDELSSOHN, whose feeble and too sensitive frame was often reduced to the last stage of suffering by intellectual exertion, when engaged in any point of difficulty, would in an instant contrive a perfect cessation from thinking, by mechanically going to the window, and counting the tiles upon the roof of his neighbour's house. Such facts show how much art may be concerned in the government of our thoughts.

It is an unquestionable fact that some profound thinkers cannot pursue their intellectual operations amidst the distractions of light and noise. With them, attention to what is passing within is interrupted by the discordant impressions from objects pressing and obtruding on the external senses. There are indeed instances, as in the case of Priestley and others, of authors who have pursued their literary works amidst conversation and their family; but such minds are not the most original thinkers, and the most refined writers; or their subjects are of a nature which requires little more than judgment and diligence. It is the mind only in its fulness which can brood over thoughts till the incubation produces vitality. Such is the feeling in this act of study. In Plutarch's time they showed a subterraneous place of study built by Demosthenes, and where he often continued for two or three months together. Malebranche, Hobbes, Corneille, and others, darkened their apartment when they wrote, to concentrate their thoughts, as Milton says of the mind, "in the spacious circuits of her musing." It is in proportion as we can suspend the exercise of all our other senses that the liveliness of our conception increases—this is the observation of the most elegant metaphysician of our times; and when Lord Chesterfield advised that his pupil—whose attention wandered on every passing object, which unfitted him for study —should be instructed in a darkened apartment, he was aware of this principle; the boy would learn, and retain what he learned, ten times as well. We close our eyes whenever we would collect our mind together, or trace more distinctly an object which seems to have faded away in our recollection. The study of an author or an artist would be ill placed in the midst of a beautiful landscape; the "Penseroso" of Milton, "hid from day's garish eye," is the man of genius. A secluded and naked apartment, with nothing but a desk, a chair, and a single sheet of paper, was for fifty years the study of BUFFON; the single ornament was a print of Newton placed before his eyes—nothing broke into the unity of his reveries. Cumberland's liveliest comedy, The West Indian, was written in an unfurnished apartment, close in front of an Irish turf-stack; and our comic writer was fully aware of the advantages of the situation. "In all my hours of study," says that elegant writer, "it has been through life my object so to locate myself as to have little or nothing to distract my attention, and therefore brilliant rooms or pleasant prospects I have ever avoided. A dead wall, or, as in the present case, an Irish turf-stack, are not attractions that can call off the fancy from its pursuits; and whilst in these pursuits it can find interest and occupation, it wants no outward aid to cheer it. My father, I believe, rather wondered at my choice." The principle ascertained, the consequences are obvious.

The arts of memory have at all times excited the attention of the studious; they open a world of undivulged mysteries, where every one seems to form some discovery of his own, rather exciting his astonishment than enlarging his comprehension. LE SAGE, a modern philosopher, had a memory singularly defective. Incapable of acquiring languages, and deficient in all those studies which depend on the exercise of the memory, it became the object of his subsequent exertions to supply this deficiency by the order and method he observed in arranging every new fact or idea he obtained; so that in reality with a very bad memory, it appears that he was still enabled to recall at will any idea or any knowledge which he had stored up. JOHN HUNTER happily illustrated the advantages which every one derives from putting his thoughts in writing, "it resembles a tradesman taking stock; without which he never knows either what he possesses, or in what he is deficient." The late WILLIAM HUTTON, a man of an original cast of mind, as an experiment in memory, opened a book which he had divided into 365 columns, according to the days of the year: he resolved to try to recollect an anecdote, for every column, as insignificant and remote as he was able, rejecting all under ten years of age; and to his surprise, he filled those spaces for small reminiscences, within ten columns; but till this experiment had been made, he never conceived the extent of his faculty. WOLF, the German metaphysician, relates of himself that he had, by the most persevering habit, in bed and amidst darkness, resolved his algebraic problems, and geometrically composed all his methods merely by the aid of his imagination and memory; and when in the daytime he verified the one and the other of these operations, he had always found them true. Unquestionably, such astonishing instances of a well-regulated memory depend on the practice of its art gradually formed by frequent associations. When we reflect that whatever we know, and whatever we feel, are the very smallest portions of all the knowledge we have been acquiring, and all the feelings we have experienced through life, how desirable would be that art which should again open the scenes which have vanished, and revivify the emotions which other impressions have effaced? But the faculty of memory, although perhaps the most manageable of all others, is considered a subordinate one; it seems only a grasping and accumulating power, and in the work of genius is imagined to produce nothing of itself; yet is memory the foundation of Genius, whenever this faculty is associated with imagination and passion; with men of genius it is a chronology not merely of events, but of emotions; hence they remember nothing that is not interesting to their feelings. Persons of inferior capacity have imperfect recollections from feeble impressions. Are not the incidents of the great novelist often founded on the common ones of life? and the personages so admirably alive in his fictions, were they not discovered among the crowd? The ancients have described the Muses as the daughters of Memory; an elegant fiction, indicating the natural and intimate connexion between imagination and reminiscence.

The arts of memory will form a saving-bank of genius, to which it may have recourse, as a wealth which it can accumulate imperceptibly amidst the ordinary expenditure. LOCKE taught us the first rudiments of this art, when he showed us how he stored his thoughts and his facts, by an artificial arrangement; and Addison, before he commenced his "Spectators," had amassed three folios of materials. But the higher step will be the volume which shall give an account of a man to himself, in which a single observation immediately becomes a clue of past knowledge, restoring to him his lost studies, and his evanescent existence. Self-contemplation makes the man more nearly entire: and to preserve the past, is half of immortality.

The worth of the diary must depend on the diarist; but "Of the things which concern himself," as MARCUS ANTONINUS entitles his celebrated work —this volume, reserved for solitary contemplation, should be considered as a future relic of ourselves. The late Sir SAMUEL ROMILLY commenced, even in the most occupied period of his life, a diary of his last twelve years; which he declares in his will, "I bequeath to my children, as it may be serviceable to them." Perhaps in this Romilly bore in mind the example of another eminent lawyer, the celebrated WHITELOCKE, who had drawn up a great work, entitled "Remembrances of the Labours of Whitelocke, in the Annals of his Life, for the Instruction of his Children." That neither of these family books has appeared, is our common loss. Such legacies from such men ought to become the inheritance of their countrymen.

To register the transactions of the day, with observations on what, and on whom, he had seen, was the advice of Lord KAIMES to the late Mr. CURWEN; and for years his head never reached its pillow without performing a task which habit had made easy. "Our best and surest road to knowledge," said Lord Kaimes, "is by profiting from the labours of others, and making their experience our own." In this manner Curwen tells us he acquired by habit the art of thinking; and he is an able testimony of the practicability and success of the plan, for he candidly tells us, "Though many would sicken at the idea of imposing such a task upon themselves, yet the attempt, persevered in for a short time, would soon become a custom more irksome to omit than it was difficult to commence."

Could we look into the libraries of authors, the studios of artists, and the laboratories of chemists, and view what they have only sketched, or what lie scattered in fragments, and could we trace their first and last thoughts, we might discover that we have lost more than we possess. There we might view foundations without superstructures, once the monuments of their hopes! A living architect recently exhibited to the public an extraordinary picture of his mind, in his "Architectural Visions of Early Fancy in the Gay Morning of Youth," and which now were "dreams in the evening of life." In this picture he had thrown together all the architectural designs his imagination had conceived, but which remained unexecuted. The feeling is true, however whimsical such unaccomplished fancies might appear when thrown together into one picture. In literary history such instances have occurred but too frequently: the imagination of youth, measuring neither time nor ability, creates what neither time nor ability can execute. ADAM SMITH, in the preface to the first edition of his "Theory of Sentiments," announced a large work on law and government; and in a late edition he still repeated the promise, observing that "Thirty years ago I entertained no doubt of being able to execute everything which it announced." The "Wealth of Nations" was but a fragment of this greater work. Surely men of genius, of all others, may mourn over the length of art and the brevity of life!