To this patient habit, Newton is indebted for many of his great discoveries; an apple falls upon him in his orchard,—­and the system of attraction succeeds in his mind! he observes boys blowing soap bubbles, and the properties of light display themselves!  Of Socrates, it is said, that he would frequently remain an entire day and night in the same attitude, absorbed in meditation; and why should we doubt this, when we know that La Fontaine and Thomson, Descartes and Newton, experienced the same abstraction?  Mercator, the celebrated geographer, found such delight in the ceaseless progression of his studies, that he would never willingly quit his maps to take the necessary refreshments of life.  In Cicero’s Treatise on Old Age, Cato applauds Gallus, who, when he sat down to write in the morning, was surprised by the evening; and when he took up his pen in the evening was surprised by the appearance of the morning.  Buffon once described these delicious moments with his accustomed eloquence:—­“Invention depends on patience; contemplate your subject long; it will gradually unfold, till a sort of electric spark convulses for a moment the brain, and spreads down to the very heart a glow of irritation.  Then come the luxuries of genius! the true hours for production and composition; hours so delightful, that I have spent twelve and fourteen successively at my writing-desk, and still been in a state of pleasure.”  The anecdote related of Marini, the Italian poet, may be true.  Once absorbed in revising his Adonis, he suffered his leg to be burnt for some time, without any sensation.

Abstraction of this sublime kind is the first step to that noble enthusiasm which accompanies Genius; it produces those raptures and that intense delight, which some curious facts will explain to us.

Poggius relates of Dante, that he indulged his meditations more strongly than any man he knew! whenever he read, he was only alive to what was passing in his mind; to all human concerns, he was as if they had not been!  Dante went one day to a great public procession; he entered the shop of a bookseller to be a spectator of the passing show.  He found a book which greatly interested him; he devoured it in silence, and plunged into an abyss of thought.  On his return he declared that he had neither seen, nor heard, the slightest occurrence of the public exhibition which had passed before him.  This enthusiasm renders everything surrounding us as distant as if an immense interval separated us from the scene.  A modern astronomer, one summer night, withdrew to his chamber; the brightness of the heaven showed a phenomenon.  He passed the whole night in observing it, and when they came to him early in the morning, and found him in the same attitude, he said, like one who had been recollecting his thoughts for a few moments, “It must be thus; but I’ll go to bed before ’tis late!” He had gazed the entire night in meditation, and did not know it.