Besides being a model of editorship, this single volume is, in so far as philosophy and the history of philosophical opinion are concerned, of itself a literature. We must add, however, that Sir William Hamilton's dissertations, though abundant, are not yet completed. Yet, in spite of this drawback, the work is one which ought to wipe away effectually from our country the reproach of imperfect learning and shallow speculation; for in depth of thought, and extent and accuracy of knowledge, the editor's own contributions are of themselves sufficient to bring up our national philosophy (which had fallen somewhat into arrear) to a level with that of the most scientific countries in Europe.
In the remarks that are to follow, we shall confine ourselves to a critique of the philosophy of Dr Reid, and of its collateral topics. Sir William Hamilton's dissertations are too elaborate and important to be discussed, unless in an article, or series of articles, devoted exclusively to themselves. Should we appear in aught to press the philosophy of common sense too hard, we conceive that our strictures are, to a considerable extent, borne out by the admissions of Sir William Hamilton himself, in regard to the tenets of the founder of the school. And should some of our shafts glance off against the editor's own opinions, he has only himself to blame for it. If we see a fatal flaw in the constitution of all, and consequently of his, psychology, it was his writings that first opened our eyes to it. So lucidly has he explained certain philosophical doctrines, that they cannot stop at the point to which he has carried them. They must be rolled forward into a new development which perhaps may be at variance with the old one, where he tarries. But his powerful arm first set the stone in motion, and he must be content to let it travel whithersoever it may. He has taught those who study him to think—and he must stand the consequences, whether they think in unison with himself or not. We, conceive, however, that even those who differ from him most, would readily own, that to his instructive disquisitions they were indebted for at least one half of all that they know of philosophy.
In entering on an examination of the system of Dr Reid, we must ask first of all, what is the great problem about which philosophers in all ages have busied themselves most, and which consequently must have engaged, and did engage, a large share of the attention of the champion of Common Sense? We must also state the fact which gives rise to the problem of philosophy.
The perception of a material universe, as it is the most prominent fact of cognition, so has it given rise to the problem which has been most agitated by philosophers. This question does not relate to the existence of the fact. The existence of the perception of matter is admitted on all hands. It refers to the nature, or origin, or constitution of the fact. Is the perception of matter simple and indivisible, or is it composite and divisible? Is it the ultimate, or is it only the penultimate, datum of cognition? Is it a relation constituted by the concurrence of a mental or subjective, and a material or objective element,—or do we impose upon ourselves in regarding it as such? Is it a state, or modification of the human mind? Is it an effect that can be distinguished from its cause? Is it an event consequent on the presence of real antecedent objects? These interrogations are somewhat varied in their form, but each of them embodies the whole point at issue, each of them contains the cardinal question of philosophy. The perception of matter is the admitted fact. The character of this fact—that is the point which speculation undertakes to canvass, and endeavours to decipher.
Another form in which the question may be put is this: We all believe in the existence of matter—but what kind of matter do we believe in the existence of? matter per se, or matter cum perceptione? If the former—this implies that the given fact (the perception of matter) is compound and submits to analysis; if the latter—this implies that it is simple and defies partition.
Opposite answers to this question are returned by psychology and metaphysics. In the estimation of metaphysic, the perception of matter is the absolutely elementary in cognition, the ne plus ultra of thought. Reason cannot get beyond, or behind it. It has no pedigree. It admits of no analysis. It is not a relation constituted by the coalescence of an objective and a subjective element. It is not a state or modification of the human mind. It is not an effect which can be distinguished from its cause. It is not brought about by the presence of antecedent realities. It is positively the first, with no forerunner. The perception-of-matter is one mental word, of which the verbal words are mere syllables. We impose upon ourselves, and we also falsify the fact, if we take any other view of it than this. Thus speaks metaphysic, though perhaps not always with an unfaltering voice.
Psychology, or the science of the human mind, teaches a very different doctrine. According to this science, the perception of matter is a secondary and composite truth. It admits of being analysed into a subjective and an objective element—a mental modification called perception on the one hand, and matter per se on the other. It is an effect induced by real objects. It is not the first datum of intelligence. It has matter itself for its antecedent. Such, in very general terms, is the explanation of the perception of matter which psychology proposes.
Psychology and metaphysics are thus radically opposed to each other in their solutions of the highest problem of speculation. Stated concisely, the difference between them is this:—psychology regards the perception of matter as susceptible of analytic treatment, and travels, or endeavours to travel, beyond the given fact: metaphysic stops short in the given fact, and there makes a stand, declaring it to be all indissoluble unity. Psychology holds her analysis to be an analysis of things. Metaphysic holds the psychological analysis to be an analysis of sounds—and nothing more.
These observations exhibit, in their loftiest generalisation, the two counter doctrines on the subject of perception. We now propose to follow them into their details, for the purpose both of eliciting the truth and of arriving at a correct judgment in regard to the reformation which Dr Reid is supposed to have effected in this department of philosophy.
The psychological or analytic doctrine is the first which we shall discuss, on account of its connexion with the investigations of Dr Reid,—in regard to whom we may state, beforehand, our conclusion and its grounds, which are these:—that Reid broke down in his philosophy, both polemical and positive, because he assumed the psychological and not the metaphysical doctrine of perception as the basis of his arguments. He did not regard the perception of matter as absolutely primary and simple; but in common with all psychologists, he conceived that it admitted of being resolved into a mental condition, and a material reality; and the consequence was, that he fell into the very errors which it was the professed business of his life to denounce and exterminate. How this catastrophe came about we shall endeavour shortly to explain.