CHAP. Inductive logic; whether confined to physics. himself reckons among the idola tribús, the fallacies incident to the species, has led some to favour this unity of physical law. Impact and gravity have each had their supporters. But we are as yet at a great distance from establishing such a generalization, nor does it appear by any means probable that it will ever assume any simple form. 67. The close connexion of the inductive process recommended by Bacon with natural philosophy in the common sense of that word, and the general selection of his examples for illustration from that science, have given rise to a question, whether he comprehended metaphysical and moral philosophy within the scope of his inquiry.* That they formed a part of the Instauration of Sciences, and therefore of the Baconian philosophy in the fullest sense of the word, is obvious from the fact that a large proportion of the treatise De Augmentis Scientiarum is dedicated to those subjects; and it is not less so that the idola of the Novum Organum are at least as apt to deceive us in moral as in physical argument. The question, therefore, can only be raised as to the peculiar method of conducting investigations, which is considered as his own. This would, however, appear to have been decided by himself in very positive language. "It may be doubted, rather than objected, by some, whether we look to the perfection, by means of our method, of natural philosophy alone, or of the other sciences also, of logic, of ethics, of politics. * This question was discussed some years since by the late editor of the Edinburgh Review on one side, and by Dugald Stewart on the other. See Edinburgh Review, vol. iii. p. 273. and the Preliminary Dissertation to Stewart's Philosophical Essays. III. But we certainly mean what has here been said, CHAP. to be understood as to them all; and as the ordinary logic, which proceeds by syllogism, does not relate to physical only, but to every other science; so ours, which proceeds by induction, comprizes them all. For we as much collect a history and form tables concerning anger, fear, shame and the like, and also concerning examples from civil life, and as much concerning the intellectual operations of memory, combination and partition, judgment and the others, as concerning heat and cold, or light, or vegetation, or such things."* But he proceeds to intimate, as far as I understand the next sentence, that, although his method or logic, strictly speaking, is applicable to other subjects, it is his immediate object to inquire into the properties of natural things, or what is generally meant by physics. To this indeed the second book of the Novum Organum, and the portions that he completed of the remaining parts of the Instauratio Magna bear witness. * Etiam dubitabit quispiam potius quam objiciet, utrum nos de naturali tantum philosophia, an etiam de scientiis reliquis, logicis, ethicis, politicis, secundum viam nostram perficiendis loquamur. At nos certè de universis hæc, quæ dicta sunt, intelligimus; atque quemadmodum vulgaris logica, quæ regit res per syllogismum, non tantum ad naturales, sed ad omnes scientias pertinet, ita et nostra, quæ procedit per inductionem, omnia complectitur. Tam enim Historiam et Tabulas Inveniendi conficimus de ira, metu et verecundia et similibus, ac etiam de exemplis rerum civilium; nec minùs de motibus mentalibus memoriæ, compositionis 68. It by no means follows, because the leading principles of the inductive philosophy are applicable to other topics of inquiry than what is usually comprehended under the name of physics, that we can employ all the prærogativæ instantiarum, and still less the peculiar rules for conducting experiments which Bacon has given us, in moral, or even psychological disquisitions. Many of them are plainly referrible to particular manipulations, or at most to limited subjects of chemical theory. And the frequent occurrence of passages which show Lord Bacon's fondness for experimental processes, seem to have led some to consider his peculiar methods as more exclusively related to such modes of inquiry than they really are. But when the Baconian philosophy is said to be experimental, we are to remember that experiment is only better than what we may call passive observation, because it enlarges our capacity of observing with exactness and expedition. The reasoning is grounded on observation in both cases. In astronomy, where nature remarkably presents the objects of our observation without liability to error or uncertain delay, we may reason on the inductive principle as well as in sciences that require tentative operations. The inference drawn from the difference of time in the occultation of the satellites of Jupiter at different seasons, in favour of the Copernican theory and against the instantaneous motion of light, is an induction of the same kind with any that could be derived from an experimentum crucis. It is an exclusion of those hypotheses which might solve many phænomena, but fail to CHAP. explain those immediately observed. III. of the lat 69. But astronomy, from the comparative soli- Advantages tariness, if we may so say, of all its phænomena, ter. and the simplicity of their laws, has an advantage that is rarely found in sciences of mere observation. Bacon justly gave to experiment, or the interrogation of nature, compelling her to give up her secrets, a decided preference whenever it can be employed; and it is unquestionably true that the inductive method is tedious, if not uncertain, when it cannot resort to so compendious a process. One of the subjects selected by Bacon in the third part of the Instauration as specimens of the method by which an inquiry into nature should be conducted, the History of Winds, does not greatly admit of experiments; and the very slow progress of meteorology, which has yet hardly deserved the name of a science, when compared with that of chemistry or optics, will illustrate the difficulties of employing the inductive method without their aid. It is not, therefore, that Lord Bacon's method of philosophizing is properly experimental, but that by experiment it is most successfully displayed. applicable phy of mind. 70. It will follow from hence that in proportion sometimes as, in any matter of inquiry, we can separate, in to philosowhat we examine, the determining conditions, or human law of form, from every thing extraneous, we shall be more able to use the Baconian method with advantage. In metaphysics, or what Stewart would have called the philosophy of the human mind, there seems much in its own nature capable of III. Less so to politics and morals. CHAP. being subjected to the inductive reasoning. Such are those facts which by their intimate connexion with physiology, or the laws of the bodily frame, fall properly within the province of the physician. In these, though exact observation is chiefly required, it is often practicable to shorten its process by experiment. And another important illustration may be given from the education of children, considered as a science of rules deduced from observation; wherein also we are frequently more able to substitute experiment for mere experience, than with mankind in general, whom we may observe at a distance, but cannot control. In politics, as well as in moral prudence, we can seldom do more than this. It seems however practicable to apply the close attention enforced by Bacon, and the careful arrangement and comparison of phænomena, which are the basis of his induction, to these subjects. Thus, if the circumstances of all popular seditions recorded in history were to be carefully collected with great regard to the probability of evidence, and to any peculiarity that may have affected the results, it might be easy to perceive such a connexion of antecedent and subsequent events in the great plurality of instances, as would reasonably lead us to form probable inferences as to similar tumults when they should occur. This has sometimes been done, with less universality, and with much less accuracy than the Baconian method requires, by such theoretical writers on politics as Machiavel and Bodin. But it has been apt to degenerate into pedantry, and to disappoint the practical statesman, who commonly rejects it with scorn; partly be |