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left for a season the three great questions of the existence of universals, of the modes of the existence of species and genus, and of their place in or out of the bosom of the individuals, and executed a compilation of such physical facts as had been then discovered.[90] A more distinctly encyclopædic work was the book of Vincent de Beauvais (d. 1264), called Speculum naturale, morale, doctrinale, et historiale—a compilation from Aquinas in some parts, and from Aristotle in others. Hallam mentions three other compilations of the thirteenth and fourteenth centuries, and observes that their laborious authors did not much improve the materials which they had amassed in their studies, though they sometimes arranged them conveniently. In the mediæval period, as he remarks, the want of capacity to discern probable truths was a very great drawback from the value of their compilations.[91]

      Far the most striking production of the thirteenth century in this kind was the Opus Majus of Roger Bacon (1267), of which it has been said that it is at once the Encyclopædia and the Novum Organum of that age;[92] at once a summary of knowledge, and the suggestion of a truer method. This, however, was merely the introductory sketch to a vaster encyclopædic work, the Compendium Philosophiæ, which was not perfected. "In common with minds of great and comprehensive grasp, his vivid perception of the intimate relationship of the different parts of philosophy, and his desire to raise himself from the dead level of every individual science, induced Bacon to grasp at and embrace the whole."[93] In truth, the encyclopædic spirit was in the air throughout the thirteenth century. It was the century of books bearing the significant titles of Summa, or Universitas, or Speculum.

      The same spirit revived towards the middle of the sixteenth century. In 1541 a book was published at Basel by one Ringelberg, which first took the name of Cyclopædia, that has since then become so familiar a word in Western Europe. This was followed within sixty years by several other works of the same kind. The movement reached its height in a book which remained the best in its order for a century. A German, one J.H. Alsted (1588–1638), published in 1620 an Encyclopædia scientiarum omnium. A hundred years later the illustrious Leibnitz pronounced it a worthy task to perfect and amend Alsted's book. What was wanting to the excellent man, he said, was neither labour nor judgment, but material, and the good fortune of such days as ours. And Leibnitz wrote a paper of suggestions for its extension and improvement.[94] Alsted's Encyclopædia is of course written in Latin, and he prefixes to it by way of motto the celebrated lines in which Lucretius declares that nothing is sweeter than to dwell apart in the serene temples of the wise. Though he informs us in the preface that his object was to trace the outlines of the great "latifundium regni philosophici" in a single syntagma, yet he really does no more than arrange a number of separate treatises or manuals, and even dictionaries, within the limits of a couple of folios. As is natural to the spirit of the age in which he wrote, great predominance is given to the verbal sciences of grammar, rhetoric, and formal logic, and a verbal or logical division regulates the distribution of the matter, rather than a scientific regard for its objective relations.

      For the true parentage, however, of the Encyclopædia of Diderot and D'Alembert, it is unnecessary to prolong this list. It was Francis Bacon's idea of the systematic classification of knowledge which inspired Diderot, and guided his hand throughout. "If we emerge from this vast operation," he wrote in the Prospectus, "our principal debt will be to the chancellor Bacon, who sketched the plan of a universal dictionary of sciences and arts at a time when there were not, so to say, either arts or sciences." This sense of profound and devoted obligation was shared by D'Alembert, and was expressed a hundred times in the course of the work. No more striking panegyric has ever been passed upon our immortal countryman than is to be found in the Preliminary Discourse.[95] The French Encyclopædia was the direct fruit of Bacon's magnificent conceptions. And if the efficient origin of the Encyclopædia was English, so did the occasion rise in England also.

      In 1727 Ephraim Chambers, a Westmoreland Quaker, published in London two folios, entitled, a Cyclopædia or Universal Dictionary of the Arts and Sciences. The idea of it was broad and excellent. "Our view," says Chambers, "was to consider the several matters, not only in themselves, but relatively, or as they respect each other; both to treat them as so many wholes, and as so many parts of some greater whole." The compiler lacked the grasp necessary to realise this laudable purpose. The book has, however, the merit of conciseness, and is a singular monument of literary industry, for it was entirely compiled by Chambers himself. It had a great success, and though its price was high (four guineas), it ran through five editions in eighteen years. On the whole, however, it is meagre, and more like a dictionary than an encyclopædia, such as Alsted's for instance.

      Some fifteen years after the publication of Chambers's Cyclopædia, an Englishman (Mills) and a German (Sellius) went to Le Breton with a project for its translation into French. The bookseller obtained the requisite privilege from the government, but he obtained it for himself, and not for the projectors. This trick led to a quarrel, and before it was settled the German died and the Englishman returned to his own country. They left the translation behind them duly executed.[96] Le Breton then carried the undertaking to a certain abbé, Gua de Malves. Gua de Malves (b. 1712) seems to have been a man of a busy and ingenious mind. He was the translator of Berkeley's Hylas and Philonous, of Anson's Voyages, and of various English tracts on currency and political economy. It is said that he first suggested the idea of a cyclopædia on a fuller plan,[97] but we have no evidence of this. In any case, the project made no advance in his hands. The embarrassed bookseller next applied to Diderot, who was then much in need of work that should bring him bread. His fertile and energetic intelligence transformed the scheme. By an admirable intuition, he divined the opportunity which would be given by the encyclopædic form, of gathering up into a whole all that new thought and modern knowledge, which existed as yet in unsystematic and uninterpreted fragments. His enthusiasm fired Le Breton. It was resolved to make Chambers's work a mere starting-point for a new enterprise of far wider scope.

      "The old and learned D'Aguesseau," says Michelet, "notwithstanding the pitiable, the wretched sides of his character, had two lofty sides, his reform of the laws, and a personal passion, the taste and urgent need of universality, a certain encyclopædic sense. A young man came to him one day, a man of letters living by his pen, and somewhat under a cloud for one or two hazardous books that lack of bread had driven him to write. Yet this stranger of dubious repute wrought a miracle. With bewilderment the old sage listened to him unrolling the gigantic scheme of a book that should be all books. On his lips, sciences were light and life. It was more than speech, it was creation. One would have said that he had made these sciences, and was still at work, adding, extending, fertilising, ever engendering. The effect was incredible. D'Aguesseau, a moment above himself, forgot the old man, received the infection of genius, and became great with the greatness of the other. He had faith in the young man, and protected the Encyclopædia."[98]

      A fresh privilege was procured (Jan. 21, 1746), and as Le Breton's capital was insufficient for a project of this magnitude, he invited three other booksellers to join him, retaining a half share for himself, and allotting the other moiety to them. As Le Breton was not strong enough to bear the material burdens of producing a work on so gigantic a scale as was now proposed, so Diderot felt himself unequal to the task of arranging and supervising every department of a book that was to include the whole circle of the sciences. He was not skilled enough in mathematics, nor in physics, which were then for the most part mathematically conceived. For that province, he associated with himself as an editorial colleague one of the most conspicuous and active members of the philosophical party. Of this eminent man, whose relations with Diderot were for some years so intimate, it is proper that we should say something.

      D'Alembert was the natural son of Madame de Tencin, by whom he had been barbarously exposed immediately after his birth. "The true ancestors of a man of genius," says Condorcet finely upon this circumstance, "are the masters who have gone before him, and his true descendants are disciples that are worthy of him." He was discovered on a November night in the year 1717, by the beadle, in a nearly dying condition on the steps of the church of St. John the Round, from which he afterwards took his Christian name. An honest woman of the common people, with that personal devotion which is less rare among the poor than among the rich, took charge of the foundling. The father, who was an officer of artillery and brother of Destouches, the author of some poor comedies, by and by advanced the small sums

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