There are some mechanical aids in reading which may prove of great utility, and form a kind of rejuvenescence of our early studies. Montaigne placed at the end of a book which he intended not to reperuse, the time he had read it, with a concise decision on its merits; "that," says he, "it may thus represent to me the air and general idea I had conceived of the author, in reading the work." We have several of these annotations. Of Young the poet it is noticed, that whenever he came to a striking passage he folded the leaf; and that at his death, books have been found in his library which had long resisted the power of closing: a mode more easy than useful; for after a length of time they must be again read to know why they were folded. This difficulty is obviated by those who note in a blank leaf the pages to be referred to, with a word of criticism. Nor let us consider these minute directions as unworthy the most enlarged minds: by these petty exertions, at the most distant periods, may learning obtain its authorities, and fancy combine its ideas. Seneca, in sending some volumes to his friend Lucilius, accompanies them with notes of particular passages, "that," he observes, "you who only aim at the useful may be spared the trouble of examining them entire." I have seen books noted by Voltaire with a word of censure or approbation on the page itself, which was his usual practice; and these volumes are precious to every man of taste. Formey complained that the books he lent Voltaire were returned always disfigured by his remarks; but he was a writer of the old school.[A] [Footnote A: The account of Oldys and his manuscripts, in the third volume of the "Curiosities of Literature," will furnish abundant proof of the value of such _disfigurations_ when the work of certain hands.--ED.] A professional student should divide his readings into a _uniform_ reading which is useful, and into a _diversified_ reading which is pleasant. Guy Patin, an eminent physician and man of letters, had a just notion of this manner. He says, "I daily read Hippocrates, Galen, Fernel, and other illustrious masters of my profession; this I call my profitable readings. I frequently read Ovid, Juvenal, Horace, Seneca, Tacitus, and others, and these are my recreations." We must observe these distinctions; for it frequently happens that a lawyer or a physician, with great industry and love of study, by giving too much into his diversified readings, may utterly neglect what should be his uniform studies. A reader is too often a prisoner attached to the triumphal car of an author of great celebrity; and when he ventures not to judge for himself, conceives, while he is reading the indifferent works of great authors, that the languor which he experiences arises from his own defective taste. But the best writers, when they are voluminous, have a great deal of mediocrity.