SECTION II.

Of the Objects of our Thoughts, when we employ general Terms.

From the account which was given in a former chapter, of the common theories of perception, it appears to have been a prevailing opinion among philosophers, that the qualities of external objects are perceived, by means of images or species transmitted to the mind by the organs of sense an opinion of which I already endeavoured to trace the origin, from certain natural prejudices suggested by the phenomena of the material world. The same train of thinking has led them to suppose that, in the case of all our other intellectual operations, there exist in the mind certain ideas distinct from the mind itself; and that these ideas are the objects about which our thoughts are employed. When I recollect, for example, the appearance of an absent friend, it is supposed that the immediate object of my thoughts is an idea of my friend; which I at first received by my senses, and which I have been enabled to retain in the mind by the faculty of memory. When I form to myself any imaginary combination by an effort of poetical invention, it is supposed, in like manner, that the parts which I combine, existed previously in the mind; and furnish the materials on which it is the province of imagination to operate. It is to Dr. Reid we owe the important remark, that all these notions are wholly hypothetical; that it is impossible to produce a shadow of evidence in support of them; and that, even although we were to admit their truth, they would not render the phenomena in question more intelligible. According to his principles, therefore, we have no ground for supposing, that, in any one operation of the mind, there exists in it an object distinct from the mind itself; and all the common expressions which involve such a supposition, are to be considered as unmeaning circumlocutions, which serve only to disguise from us the real history of the intellectual phenomena.*

* In order to prevent misapprehensions of Dr. Reid's meaning, in his reasonings

"We are at a loss to know," says this excellent philosopher," how we perceive distant objects; how we remember things past; how we imagine things that have no existence. Ideas in the mind seem to account for all these operations; they are all by the means of ideas reduced to one operation; to a kind of feeling, or immediate perception of things present, and in contact with the percipient; and feeling is an operation so familiar, that we think it needs no explanation, but may serve to explain other operations."

"But this feeling, or immediate perception, is as difficult to be comprehended, as the things which we pretend to explain by it. Two things may be in contact, without any feeling or perception; there must therefore be in the percipient, a power to feel, or to perceive. How this power is produced, and how it operates, is quite beyond the reach of our knowledge. As little

against the ideal theory, it may be necessary to explain, a little more fully than I have done in the text, in what sense he calls in question the existence of ideas; for the meaning which this word is employed to convey in popular discourse, differs widely from that which is annexed to it by the philosophers whose opinion he controverts. This explanation I shall give in his own words:

"In popular language, idea signifies the same thing as conception, apprehension, notion. To have an idea of any thing, is to conceive it. To have a distinct idea, is to conceive it distinctly. To have no idea of it, is not to conceive it at all.-When the word idea is taken in this popular sense, no man can possibly doubt whether he has ideas."

"According to the philosophical meaning of the word idea, it does not signify that act of the mind which we call thought, or conception, but some object of thought. Of these objects of thought called ideas, different sects of philosophers have given very different accounts."

"Some have held them to be self-existent; others to be in the divine mind; others in our own minds; and others in the brain, or sensorium." p. 213.

"The Peripatetic system of species and phantasms, as well as the Platonic system of ideas, is grounded upon this principle, that in every kind of thought, there must be some object that really exists; in every operation of the mind, something to work upon. Whether this immediate object be called an idea with Plato, or a phantasm or species with Aristotle; whether it be eternal and uncreated, or produced by the impressions of external objects, is of no consequence in the present argument." Ibid p. 388.

"So much is this opinion fixed in the minds of philosophers, that, I doubt not but it will appear to most, a very strange paradox, or rather a contradiction, that men should think without ideas. But this appearance of contradiction arises from the ambiguity of the word idea. If the idea of a thing means only the thought of it, which is the most common meaning of the word, to think without ideas, is to think without thought; which is undoubtedly a contradiction. But an idea, according to the definition given of it by philosophers, is not thought, but an object of thought, which really exists, and is perceived," &c. Ibid. p. 390.

I have only to add, that when, in this work, I make use of the word idea in stating my own opinions, I employ it uniformly in the popular sense, and not in the philosophical sense, as now explained: it would be better, perhaps, to avoid it altogether; but I have found it difficult to do so, without adopting unusual modes of expression. I flatter myself that I have used it with due caution.

can we know, whether this power must be limited to things present, and in contact with us. Neither can any man pretend to prove, that the Being who gave us the power to perceive things present, may not give us the power to perceive things distant, to remember things past, and to conceive things that never existed." *

In another part of this work, Dr. Reid has occasion to trace the origin of the prejudice which has led philosophers to suppose, that, in all the operations of the understanding, there must be an object of thought, which really exists while we think of it. His remarks on this subject, which are highly ingenious and satisfactory, are contained in his account of the different theories concerning conception.†

As in all the ancient metaphysical systems it was taken for granted, (probably from the analogy of our external perceptions,) that every exertion of thought implies the existence of an object distinct from the thinking being; it naturally occurred, as a very curious question, What is the immediate object of our attention, when we are engaged in any general speculation; or, in other words, What is the nature of the idea corresponding to a general term? When I think of any particular object which I have formerly perceived, such as a particular friend, a particular tree, or a particular mountain, I can comprehend what is meant by a picture or representation of such objects; and therefore the explanation given by the ideal theory of that act of the mind which we formerly called Conception, if not perfectly satisfactory, is at least not wholly unintelligible. But what account shall we give, upon the principles of this theory, of the objects of my thoughts, when I employ the words, friend, tree, mountain, as generic terms? For, that all the things I have ever perceived are individuals, and consequently, that the ideas denoted by general words, (if such ideas exist,) are not copied from any originals that have fallen under my observation, is not only self-evident, but almost an identical proposi

tion.

* Essays on the Intellectual Powers, p. 214.

† Ibid. p. 378.

VOL. I.

16

In answer to this question, the Platonists, and at a still earlier period, the Pythagoreans, taught, that, although these universal ideas are not copied from any objects perceivable by sense, yet that they have an existence independent of the human mind, and are no more to be confounded with the understanding, of which they are the proper objects, than material things are to be confounded with our powers of external perception; that as all the individuals which compose a genus, must possess something in common; and as it is in consequence of this, that they belong to that genus, and are distinguishable by the same name, this common thing forms the essence of each, and is the object of the understanding, when we reason concerning the genus.— They maintained also, that this common essence,* notwithstanding its inseparable union with a multitude of different individuals, is in itself one, and indivisible.

On most of these points, the philosophy of Aristotle seems to have coincided very nearly with that of Plato. The language, however, which these philosophers employed on this subject was different, and gave to their doctrines the appearance of a wider diversity than probably existed between their opinions. While Plato was led by his passion for the marvellous and the mysterious, to insist on the incomprehensible union of the same idea or essence, with a number of individuals, without multiplication or division;† Aristotle, more cautious, and aiming at greater perspicuity, contented himself with saying, that all individuals are composed of matter and form, and that it is in consequence of possessing a common form, that different individuals belong

* In this very imperfect sketch of the opinions of the ancients concerning universals, I have substituted, instead of the word idea, the word essences better fitted to convey to a modern reader the true import of Plato's expressions. The word essentia is said to have been first employed by Cicero; and it was afterwards adopted by the school-men, in the same sense in which the Platonists used the word idea. See Dr. Reid's Essays on the Intellectual Powers, p. 473.

"The idea of a thing," says Plato, "is that which makes one of the many; which, preserving the unity and integrity of its own nature, runs through and mixes with things infinite in number; and yet, however multiform it may appear, is always the same: so that by it we find out and discriminate the thing, whatever shapes it may assume, and under whatever disguise it may conceal itself."-PLATO in PHILEBO; (quoted by the author of the Origin and Progress of Language, vol. i. p. 100, 2d edit.).

to the same genus. But they both agreed, that, as the matter, or the individual natures of objects were perceived by sense, so the general idea, or essence, or form, was perceived by the intellect; and that, as the attention of the vulgar was chiefly engrossed with the former, so the latter furnished to the philosopher the materials of his speculations.

The chief difference between the opinions of Plato and Aristotle on the subject of ideas, related to the mode of their existence. That the matter of which all things are made, existed from eternity, was a principle which both admitted; but Plato farther taught, that, of every species of things, there is an idea of form which also existed from eternity, and that this idea is the exemplar or model according to which the individuals of the species were made; whereas Aristotle held, that, although matter may exist without form, yet that forms could not exist without matter.*

The doctrine of the Stoics concerning universals differed widely from those both of Plato and Aristotle, and seems to have approached to a speculation which is commonly supposed to be of a more recent origin, and which an eminent philosopher of the present age has ranked among the discoveries which do the greatest honor to modern genius.†

*In this account of the difference between Plato and Aristotle on the subject of ideas, I have chiefly followed Brucker, whose very laborious researches with respect to this article of the history of philosophy are well known. In stating the distinction, however, I have confined myself to as general terms as possible; as the subject is involved in much obscurity, and has divided the opinions of very eminent writers. The reader will find the result of Brucker's inquiries, in his own words, in Note (F.)

The authority of Brucker, in this instance, has the more weight with me, as it coincides in the most material respects with that of Dr. Reid. See his Essays on the Intellectual Powers of Man, and the conclusion of his Inquiry into the Human Mind.

A very different account of Aristotle's doctrine, in those particulars in which it is commonly supposed to differ from that of Plato, is given by two modern writers of great learning, whose opinions are justly entitled to much respect, from their familiar acquaintance with Aristotle's latter Commentators of the Alexandrian School. See Origin and Progress of Language, vol. i. and HARRIS's Hermes

It is of no consequence, for any of the purposes which I have at present in view, what opinion we form on this much controverted point of philosophical history. In so far as the ideal theory was an attempt to explain the manner in which our general speculations are carried on, it is agreed on all hands, that the doctrines of Plato and Aristotle were essentially the same; and accordingly, what I have said on that subject, coincides entirely with a passage which the reader will find in Origin and Progress of Language, vol. i. p. 38, 2d edit.

†Treatise of Human Nature, book i. part i. sect. 7.