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 depicted what each science had accomplished and what still remained for each to do; and the development of the new method. Bacon published his survey of the circle of the sciences in the English work, the Advancement of Learning, 1605, a much enlarged revision of which, De Dignitate et Augmentis Scientiarum, appeared in Latin in 1623. In 1612 he printed as a contribution to methodology the draft, Cogitata et Visa (written 1607), later recast into the [first book of the] Novum Organum, 1620. This title, Novum Organum, of itself indicates opposition to Aristotle, whose logical treatises had for ages been collected under the title Organon. If in this work Bacon had given no connected exposition of his reforming principles, but merely a series of aphorisms, and this an incomplete one, the remaining parts are still more fragmentary, only prefaces and scattered contributions having been reduced to writing. The third part was to have been formed by a description of the world or natural history, Historia Naturalis, and the last,—introduced by a Scala Intellectus (ladder of knowledge, illustrations of the method by examples), and by Prodromi (preliminary results of his own inquiries),—by natural science, Philosophia Secunda. The best edition of Bacon's works is the London one of Spedding, Ellis & Heath, 1857 seq., 7 vols., 2d ed., 1870; with 7 volumes additional of The Letters and Life of Francis Bacon, including His Occasional Works, and a Commentary, by J. Spedding, 1862-74. Spedding followed this further with a briefer Account of the Life and Times of Francis Bacon, 2 vols., 1878.