After thirty years of voluntary exile, the melancholy, solitary, great-souled man lay in his native Florence. He had loved liberty and uprightness. He had been ambitious, and devoted to his masterly work, with the will-power and intensity which belong to genius. He had allowed no obstacles to stand in his path,--neither lack of money nor jealousy of artists. He had faith in himself. He spoke sometimes too plainly, but almost always justly. Cold and unapproachable though he was, children loved him, and for them he would stop and make sketches on the street. He had the fearlessness of one who rightly counts manhood above all titles. He was too noble to be trifling, or petty, or self-indulgent. Great in sculpture, painting, poetry, architecture, engineering, character, he has left an imperishable name. Taine says, "There are four men in the world of art and of literature exalted above all others, and to such a degree as to seem to belong to another race; namely, Dante, Shakespeare, Beethoven, and Michael Angelo." LEONARDO DA VINCI. "The world perhaps contains no example of a genius so universal, so creative, so incapable of self-contentment, so athirst for the infinite, so naturally refined, so far in advance of his own and of subsequent ages. His countenances express incredible sensibility and mental power; they overflow with unexpressed ideas and emotions. Michael Angelo's personages alongside of his are simply heroic athletes; Raphael's virgins are only placid children, whose sleeping souls have not yet lived." Thus writes Taine of Da Vinci, in his "Travels in Italy." [Illustration: LEONARDO DA VINCI.] Mrs. Jameson calls Leonardo da Vinci, in her "Early Italian Painters," "_The_ miracle of that age of miracles. Ardent and versatile as youth; patient and persevering as age; a most profound and original thinker; the greatest mathematician and most ingenious mechanic of his time; architect, chemist, engineer, musician, poet, painter!" Hallam, in his "History of the Literature of Europe," says of the published extracts from the great volumes of manuscript left by Leonardo, "These are, according to our common estimate of the age in which he lived, more like revelations of physical truths vouchsafed to a single mind, than the superstructure of its reasoning upon any established basis. The discoveries which made Galileo, Kepler, Castelli, and other names illustrious--the system of Copernicus--the very theories of recent geologists, are anticipated by Da Vinci within the compass of a few pages, not perhaps in the most precise language, or on the most conclusive reasoning, but so as to strike us with something like the awe of preternatural knowledge. In an age of so much dogmatism, he first laid down the grand principle of Bacon, that experiment and observation must be the guides to just theory in the investigation of nature.