图书图片
PDF
ePub

of the Royal Society, or rather the love of physical science out of which that institution arose, in the second part of the seventeenth century, made England resound with the name of her illustrious chancellor. Few now spoke of him without a kind of homage that only the greatest men receive. Yet still it was by natural philosophers alone that the writings of Bacon were much studied. The editions of his works, except the Essays, were few; the Novum Organum never came separately from the English press.* They were not even frequently quoted; for I believe it will be found that the fashion of referring to the brilliant passages of the De Augmentis and the Novum Organum, at least in books designed for the general reader, is not much older than the close of the last century. Scotland has the merit of having led the way; Reid, Stewart, Robison, and Playfair turned that which had been a blind veneration into a rational worship; and I should suspect that more have read Lord Bacon within these thirty years than in the two preceding centuries. It may be an usual consequence of the enthusiastic panegyrics

to any subjects which require entire conviction. A certain deduction from certain premises is the only reasoning they acknowledge. Lord Bacon has a remarkable passage on this in the 9th book De Augmentis. Postquam articuli et principia religionis jam in sedibus suis fuerint locata, ita ut a rationis examine penitus eximantur, tum demum conceditur ab illis illationes derivare ac deducere, secundum analogiam ipsorum. In rebus quidem naturalibus hoc non tenet. Nam et ipsa principia examini subjiciuntur; per inductionem, inquam, licet minime per syllogismum. Atque eadem illa nullam habent cum ratione repugnantiam, ut ab eodem fonte cum primæ propositiones, tum media, deducantur. Aliter fit in religione: ubi et primæ propositiones authopystatæ sunt atque per se subsistentes; et rursus non reguntur ab illa ratione quæ propositiones consequentes deducit. Neque tamen hoc fit in religione sola, sed etiam in aliis scientiis, tam gravioribus, quam levioribus, ubi scilicet propositiones humanæ placita sunt, non posita; siquidem et in illis rationis usus absolutus esse non potest. Videmus enim in ludis, puta schaccorum, aut similibus, priores ludi normas et

leges merè positivas esse, et ad placitum; quas recipi, non in disputationem vocari, prorsus oporteat; ut vero vincas, et peritè lusum instituas, id artificiosum est et rationale. Eodem modo fit et in legibus humanis; in quibus haud pauca sunt maximæ, ut loquuntur, hoc est, placita mera juris, quæ auctoritate magis quam ratione nituntur, neque in disceptationem veniunt. Quid vero sit justissimum, non absolutè, sed relativè, hoc est ex analogiâ illarum maximarum, id demum rationale est, et latum disputationi campum præbet. This passage, well weighed, may show us where, why, and by whom, the synthetic and syllogistic methods have been preferred to the inductive and analytical.

*The De Augmentis was only once published after the first edition, in 1638. An indifferent translation, by Gilbert Watts, came out in 1640. No edition of Bacon's Works was published in England before 1730; another appeared in 1740, and there have been several since. But they had been printed at Frankfort in 1665. It is unnecessary to observe, that many copies of the foreign editions were brought to this country. This is mostly taken from Mr. Montagu's account.

lately poured upon his name, that a more positive efficacy has sometimes been attributed to his philosophical writings than they really possessed, and it might be asked whether Italy, where he was probably not much known, were not the true school of experimental philosophy in Europe, whether his methods of investigation were not chiefly such as men of sagacity and lovers of truth might simultaneously have devised. But, whatever may have been the case with respect to actual discoveries in science, we must give to written wisdom its proper meed; no books prior to those of Lord Bacon carried mankind so far on the road to truth; none have obtained so thorough a triumph over arrogant usurpation without seeking to substitute another; and he may be compared to those liberators of nations, who have given them laws by which they might govern themselves, and retained no homage but their gratitude.*

* I have met, since this passage was written, with one in Stewart's Life of Reid, which seems to state the effects of Bacon's philosophy in a just and temperate spirit, and which I rather quote because this writer has, by his eulogies on that philosophy, led some to an exaggerated notion. "The influence of Bacon's genius on the subsequent progress of physical discovery has been seldom duly appreciated; by some writers almost entirely overlooked, and by others considered as the sole cause of the reformation in science which has since taken place. Of these two extremes, the latter certainly is the least wide of the truth: for in the whole history of letters no other individual can be mentioned whose exertions have had so indisputable an effect in forwarding the intellectual progress of mankind. On the other hand it must be acknowledged, that before the era when Bacon appeared, various philosophers in different parts of Europe had struck into the right path; and it may perhaps be doubted, whether any one important rule with respect to the true method of investigation be contained in his works, of which no hint can be traced in those of his predecessors. His great merit lay in concentrating their feeble and scattered

lights; fixing the attention of philosophers on the distinguishing characteristics of true and of false science, by a felicity of illustration peculiar to himself, seconded by the commanding powers of a bold and figurative eloquence. The method of investigation which he recommended had been previously followed in every instance in which any solid discovery had been made with respect to the laws of nature; but it had been followed accidentally and without any regular preconceived design; and it was reserved for him to reduce to rule and method what others had effected, either fortuitously, or from some momentary glimpse of the truth. These remarks are not intended to detract from the just glory of Bacon; for they apply to all those, without exception, who have systematised the principles of any of the arts. Indeed they apply less forcibly to him than to any other philosopher whose studies have been directed to objects analogous to his; inasmuch as we know of no art of which the rules have been reduced successfully into a didactic form, when the art itself was as much in infancy as experimental philosophy was when Bacon wrote." Account of Life and Writings of Reid, sect. 2.

SECT. III.

On the Metaphysical Philosophy of Descartes.

Early life of

81. RENÉ DESCARTES was born in 1596, of an ancient family in Touraine. An inquisitive curiosity into the nature and causes of all he saw is said to have Descartes. distinguished his childhood, and this was certainly accompanied by an uncommon facility and clearness of apprehension. At a very early age he entered the college of the Jesuits at La Fleche, and passed through their entire course of literature and philosophy. It was now, at the age of sixteen, as he tells us, that he began to reflect, with little satisfaction, on his studies, finding his mind beset with error, and obliged to confess that he had learned nothing but the conviction of his ignorance. Yet he knew that he had been educated in a famous school, and that he was not deemed behind his contemporaries. The ethics, the logic, even the geometry of the ancients, did not fill his mind with that clear stream of truth, for which he was ever thirsting. On leaving La Fleche, the young Descartes mingled for some years in the world, and served as a volunteer both under Prince Maurice, and in the Imperial army. Yet during this period there were intervals when he withdrew himself wholly from society, and devoted his leisure to mathematical science. Some germs also of his peculiar philosophy were already ripening in his mind.

His begin

losophise.

82. Descartes was twenty-three years old when, passing a solitary winter in his quarters at Neuburg on the Danube, he began to revolve in his mind the futility ning to phiof all existing systems of philosophy, and the discrepancy of opinions among the generality of mankind, which rendered it probable that no one had yet found out the road to real science. He determined, therefore, to set about the investigation of truth for himself, erasing from his mind all preconceived judgments, as having been hastily and precariously taken up. He laid down for his guidance a few fundamental rules of logic, such as to admit nothing as true which he did not clearly perceive, and to proceed from the simpler notions to the more complex, taking the method of geometers, by which

[blocks in formation]

they had gone so much farther than others, for the true art of reasoning. Commencing, therefore, with the mathematical sciences, and observing that, however different in their subjects, they treat properly of nothing but the relations of quantity, he fell, almost accidentally, as his words seem to import, on the great discovery that geometrical curves may be expressed algebraically.* This gave him more hope of success in applying his method to other parts of philosophy.

83. Nine years more elapsed, during which Descartes, He retires though he quitted military service, continued to to Holland. observe mankind in various parts of Europe, still keeping his heart fixed on the great aim he had proposed to himself, but, as he confesses, without having framed the scheme of any philosophy beyond those of his contemporaries. He deemed his time of life immature for so stupendous a task. But at the age of thirty-three, with little notice to his friends, he quitted Paris, convinced that absolute retirement was indispensable for that rigorous investigation of first principles which he now determined to institute, and retired into Holland. In this country he remained eight years so completely aloof from the distractions of the world, that he concealed his very place of residence, though preserving an intercourse of letters with many friends in France.

cations.

84. In 1637 he broke upon the world with a volume conHis publi- taining the Discourse upon Method, the Dioptrics, the Meteors, and the Geometry. It is only with the first that we are for the present concerned.† In this discourse, the most interesting, perhaps, of Descartes' writings, on account of the picture of his life, and of the progress of his studies that it furnishes, we find the Cartesian metaphysics, which do not consist of many articles, almost as fully detailed as in any of his later works. In the Meditationes de Prima Philosophia, published in 1641, these fundamental principles are laid down again more at length. He invited the criticism of philosophers on these famous Meditations. They did not refuse the challenge; and seven sets of objec tions, from as many different quarters, with seven replies from Descartes himself, are subjoined to the later editions of

* Euvres de Descartes, par Cousin, † Id. p. 121-212. Paris, 1824, vol. i. p. 143.

the Meditations. The Principles of Philosophy, published in Latin in 1644, contains what may be reckoned the final statement, which occupies most of the first book, written with uncommon conciseness and precision. The beauty of philosophical style which distinguishes Descartes is never more seen than in this first book of the Principia, the translation of which was revised by Clerselier, an eminent friend of the author. It is a contrast at once to the elliptical brevity of Aristotle, who hints, or has been supposed to hint, the most important positions in a short clause, and to the verbose, figurative declamation of many modern metaphysicians. In this admirable perspicuity Descartes was imitated by his disciples Arnaud and Malebranche, especially the former. His unfinished posthumous treatise, the "Inquiry after Truth by Natural Reason," is not carried farther than a partial development of the same leading principles of Cartesianism. There is, consequently, a great deal of apparent repetition in the works of Descartes, but such as on attentive consideration will show, not perhaps much real variance, but some new lights that had occurred to the author in the course of his reflections.*

all.

85. In pursuing the examination of the first principles of knowledge, Descartes perceived not only that he had He begins cause to doubt of the various opinions which he had by doubting found current among men, from that very circumstance of their variety, but that the sources of all which he had received for truth themselves, namely, the senses, had afforded him no indisputable certainty. He began to recollect how often he had been misled by appearances, which had at first sight given no intimation of their fallacy, and asked himself in vain, by what infallible test he could discern the reality of external objects, or at least their conformity to his idea of them. The strong impressions made in sleep led him to inquire whether all he saw and felt might not be in a dream. It was true that there seemed to be some notions more elementary

A work has lately been published, Essais Philosophiques, suivis de la Metaphysique de Descartes assemblée et mise en ordre, par L. A. Gruyer, 4 vols., Bruxelles, 1832. In the fourth volume we find the metaphysical passages in the writings of Descartes, including his cor

respondence, arranged methodically in his own words, but with the omission of a large part of the objections to the Meditations and of his replies. I did not, however, see this work in time to make use of it.

« 上一页继续 »