Part 20

It is true that, if certain views which, if I understand them rightly, some Philosophers have seriously entertained, were true ones, it would be quite impossible that any of them should be judgments of perception. For some philosophers seem to me to have denied that we ever do in fact know such things as these, and others not only that we ever know them but also that they are ever true. And, if, in fact, I never do know such a thing, or if it is never true, it will of course, follow that I never perceive such a thing; since I certainly cannot, in this sense, perceive anything whatever, unless I both know it and it is true. But it seems to me a sufficient refutation of such views as these, simply to point to cases in which we do know such things. This, after all, you know, really is a finger: there is no doubt about it: I know it, and you all know it. And I think we may safely challenge any philosopher to bring forward any argument in favour either of the proposition that we do not know it, or of the proposition that it is not true, which does not at some point, rest upon some premiss which is, beyond comparison, less certain than is the proposition which it is designed to attack. The questions whether we do ever know such things as these, and whether there are any material things, seem to me, therefore, to be questions which there is no need to take seriously: they are questions which it is quite easy to answer, with certainty, in the affirmative. What does, I think, need to be taken seriously, and what is really dubious, is not the question, whether this is a finger, or whether I know that it is, but the question _what,_ in certain respects, I am knowing, when I know that it is. And this is the question to which I will now address myself.

To begin with there is one thing which seems to me to be very certain indeed about such judgments. It is unfortunately a thing which I do not know how properly to express. There seem to me to be objections to every way of expressing it which I can think of. But I hope I may be able to make my meaning clear, in spite of the inadequacy of my expression. The thing I mean is a thing which may to some people seem so obvious as to be scarcely worth saying. But I cannot help thinking that it is not always clearly recognised, and even that some philosophers, to judge from what they say, might perhaps dispute it. It seems to me to be an assumption which is silently made in many treatments of the subject, and, as I say, it seems to me to be very certain indeed. But I think it is at all events worth while to try to make the assumption explicit, in case it should be disputed. If it really is not true, then the other questions to which I shall go on, and which seem to me really dubious and difficult, do not, I think, arise at all.

I will try to express this fundamental assumption, which seems to me so very certain, by saying it is the assumption that, in all cases in which I make a judgment of this sort, I have no difficulty whatever in picking out a thing, which is, quite plainly, in a sense in which nothing else is, _the_ thing about which I am making my judgment; and that yet, though this thing is _the_ thing about which I am judging, I am, quite certainly, _not_, in general, judging with regard to it, that _it_ is a thing of that kind for which the term, which seems to express the predicate of my judgment, is a name. Thus, when I judge, as now, that That is an inkstand, I have no difficulty whatever in picking out, from what, if you like, you can call my total field of presentation at the moment, an object, which is undoubtedly, in a sense in which nothing else is, _the_ object about which I am making this judgment; and yet it seems to me quite certain that of _this_ object I am not judging that it is a whole inkstand. And similarly when I judge, with regard to something which I am feeling in my pocket, "This is a coin," I have no difficulty in picking out, from my field of presentation, an object, which is undoubtedly _the_ object with which my judgment is concerned; and yet I am certainly not judging with regard to this object that it is a whole coin. I say that _always__t_ when I make such a judgment, I can pick out _the_ one, among the objects presented to me at the time, about which I am making it; but I have only said that _in general_ I am not judging with regard to this object that it is a thing of the kind, for which the term, which seems to express the predicate of my judgment, is a name. And I have limited my second proposition in this way, because there are cases, in which it does not, at first sight, seem quite so certain that I am not doing this, as in the two instances I have just given. When, for instance, I judge with regard to something, which I am seeing, "This is a soap-bubble," or "This is a drop of water," or even when I judge "This is a spot of ink," it may not seem quite so plain, that I may not be judging, with regard to the very object presented to me, that it is, itself, a whole soap-bubble, a whole drop of water, or a whole spot of ink, as it always is, in the case of an inkstand, or a coin, that I never take the presented object, about which I am judging, to be a whole inkstand, or a whole coin. The sort of reason why I say this will, of course, be obvious to any one, and it is obviously of a childish order. But I cannot say that it seems to me quite obvious that in such a case I am not judging of the presented object that it is a whole drop of water, in the way in which it does seem to be obvious that I am not judging of _this_ presented object that it is an inkstand. That is why I limit myself to saying that, _in general_, when I judge "That is a so-and-so" I am not judging with regard to the presented object, about which my judgment is that _it_ is a thing of the kind in question. As much as this seems to me to be a thing which any child can see. Nobody will suppose, for a moment, that when he judges such things as "This is a sofa," or "This is a tree," he is judging, with regard to the presented object about which his judgment plainly is, that it is a whole sofa or a whole tree: he can, at most, suppose that he is judging it to be a part of the surface of a sofa or a part of the surface of a tree. And certainly in the case of most judgments of this kind which we make, whether in the case of all or not, this is plainly the case: we are not judging, with regard to the presented object about which our judgment plainly is, that it is a thing of the kind, for which the term which appears to express the predicate of our judgment, is a name. And that this should be true of _most_ judgments of this kind, whether of all or not, is quite sufficient for my purpose.

This much, then, seems to me to be very certain indeed. But I will try to make clearer exactly what I mean by it, by mentioning a ground on which I imagine it might perhaps be disputed.

The object of which I have spoken as _the_ object, about which, in each particular case, such a judgment as this always is a judgment, is, of course, always an object of the kind which some philosophers would call a sensation, and others would call a sense-datum. Whether all philosophers, when they talk of sensations, mean to include among them such objects as these, I do not know. Some, who have given a great deal of attention to the subject, and for whom I have a great respect, talk of sensations in such a way, that I cannot be sure what they are talking about at all or whether there are such things. But many, I think, undoubtedly do mean to include such subjects as these. No doubt, in general, when they call them sensations, they mean to attribute to them properties, which it seems to me extremely doubtful whether they possess. And perhaps even those who call them sense-data, may, in part, be attributing to them properties which it may be doubtful whether they possess. If we want to define a sensation or a sense-datum, in a manner which will leave it not open to doubt what sort of things we are talking of, and that there are such things, I do not know that we can do it better than by saying that sense-data are the sort of things, _about_ which such judgments as these always seem to be made--the sort of things which seem to be the real or ultimate subjects of all such judgments. Such a way of defining how the term "sense-datum" is used, may not seem very satisfactory; but I am inclined to think it may be as satisfactory as any which can be found. And it is certainly calculated to obviate some misunderstandings which may arise; since everybody can see, I think, what the thing is which I am describing as _the_ thing about which he is making his judgment, when he judges "That is an inkstand," and that there is such a thing, even if he does not agree that this description applies to it.

I can, in fact, imagine that some of those who would call this thing a sensation would deny that my judgment is _about_ it at all. It would sometimes be spoken of as the sensation which mediates my perception of this inkstand in this instance. And I can imagine that some of those who would so speak of it might be inclined to say that when I judge "This is an inkstand," my judgment is about this inkstand which I perceive, and not, in any sense at all, about the sensation which mediates my perception of it. They may perhaps imagine that the sensation mediates my perception of the inkstand only in the sense that it brings the inkstand before my mind in such a way that, once it is before my mind, I can make a judgment about it, which is _not_ a judgment about the mediating sensation at all; and that such a judgment is the one I am actually expressing when I say "This is an inkstand." Such a view, if it is held, seems to me to be quite certainly false, and is what I have intended to deny. And perhaps I can put most clearly the reason why it seems to me false, by saying that, if (which may be doubted) there is anything which is this inkstand, that thing is certainly not given to me independently of this sense-datum, in such a sense that I can possibly make a judgment about it which is _not_ a judgment about this sense-datum. I am not, of course, denying that I do perceive this inkstand, and that my judgment is, in a sense, a judgment about it. Both these things seem to me to be quite obviously true. I am only maintaining that my judgment is _also,_ in another sense, a judgment about this sense-datum which mediates my perception of the inkstand. Those who say that this sense-datum does mediate my perception of the inkstand, would, of course, admit that my perception of the inkstand is, in a sense, dependent upon the sense-datum; that it is dependent is implied in the mere statement that it is mediated by it. But it might be maintained that it is dependent on it only in the sense in which, when the idea of one object is called up in my mind, through association, by the idea of another, the idea which is called up is dependent on the idea which calls it up. What I wish to maintain, and what seems to me to be quite certainly true, is that my perception of this inkstand is dependent on this sense-datum, in a quite different and far more intimate sense than this. It is dependent on it in the sense that, if there is anything which is this inkstand, then, in perceiving that thing, I am knowing it _only_ as _the_ thing which stands in a certain relation to this sense-datum. When the idea of one object is called up in my mind by the idea of another, I do not know the second object _only_ as _the_ thing which has a certain relation to the first: on the contrary, I can make a judgment about the second object, which is not a judgment about the first. And similarly in the case of two sense-data which are presented to me simultaneously, I do not know the one _only_ as a thing which has a certain relation to the other. But in the case of this sense-datum and this inkstand the case seems to me to be plainly quite different. If there be a thing which is this inkstand at all, it is certainly _only_ known to me as _the_ thing which stands in a certain relation to this sense-datum. It is not given to me, in the sense in which this sense-datum is given. If there be such a thing at all, it is quite certainly only known to me by description, in the sense in which Mr. Russell uses that phrase; and the description by which it is known is that of being _the_ thing which stands to this sense-datum in a certain relation. That is to say, when I make such a judgment as "This inkstand is a good big one"; what I am really judging is: "There is a thing which stands to _this_ in a certain relation, and which is an inkstand, and that thing is a good big one"--where "_this_" stands for this presented object. I am referring to or identifying the thing which is this inkstand, if there be such a thing at all, only as the thing which stands to this sense-datum in a certain relation; and hence my judgment, though in one sense it may be said to be a judgment about the inkstand, is quite certainly also, in another sense, a judgment about this sense-datum. This seems to me so clear, that I wonder how anyone can deny it; and perhaps nobody would. But I cannot help thinking that it is not clear to everybody; partly because, so far as I can make out, nobody before Mr. Russell had pointed out the extreme difference there is between a judgment about a thing known only by description to the individual who makes the judgment, and a judgment about a thing not known to him only in this way; and partly because so many people seem still utterly to have failed to understand what the distinction is which he expresses in this way. I will try to make the point clear, in a slightly different way. Suppose I am seeing two coins, lying side by side, and am not perceiving them in any other way except by sight. It will be plain to everybody, I think, that, when I identify the one as "This one" and the other as "That one," I identify them only by reference to the two visual presented objects, which correspond respectively to the one and to the other. But what may not, I think, be realised, is that the sense in which I identify them by reference to the corresponding sense-data, is one which involves that every judgment which I make about the one is a judgment about the sense-datum which corresponds to it, and every judgment I make about the other, a judgment about the sense-datum which corresponds to _it_: I simply cannot make a judgment about either, which is not a judgment about the corresponding sense-datum. But if the two coins were given to me, in the sense in which the two sense-data are, this would certainly not be the case. I can identify and distinguish the two sense-data _directly,_ this as this one, and that as that one: I do not need to identify either as _the_ thing which has this relation to this other thing. But I certainly cannot thus directly identify the two coins. I have not four things presented to me (1) _this_ sense-datum, (2) _that_ sense-datum, (3) _this_ coin, and (4) _that_ coin, but two only_--this_ sense-datum and _that_ sense-datum. When, therefore, I judge "_This_ is a coin," my judgment is certainly a judgment about the one sense-datum, and when I judge "And _that_ is also a coin," it is certainly a judgment about the other. Only, in spite of what my language might seem to imply, I am certainly not judging either of the one sense-datum that it is a whole coin, nor yet of the other that it is one.

This, then, seems to me fundamentally certain about judgments of this kind. Whenever we make such a judgment we can easily pick out an object (whether we call it a sensation or a sense-datum, or not), which is, in an easily intelligible sense, _the_ object which is the real or ultimate subject of our judgment; and yet, in many cases at all events, what we are judging with regard to this object is certainly not that it is an object of the kind, for which the term which appears to express the predicate of our judgment is a name.

But if this be so, what is it that I am judging, in all such cases, about the presented object, which is the real or ultimate subject of my judgment? It is at this point that we come to questions which seem to me to be really uncertain and difficult to answer.

To begin with, there is one answer which is naturally suggested by the reason I have given for saying that, in this case, it is quite obvious that I am not judging, with regard to this presented object, that _it_ is an inkstand, whereas it is not in the same way, quite obvious that, in making such a judgment as "This is a soap-bubble" or "This is a drop of water," I may not be judging, of the object about which my judgment is, that that very object really is a soap-bubble or a drop of water. The reason I gave is that it is quite obvious that I do not take this presented object to be a _whole_ inkstand: that, at most, I only take it to be part of the surface of an inkstand. And this reason naturally suggests that the true answer to our question may be that what I am judging of the presented object is just that it is a part of the surface of an inkstand. This answer seems to me to be obviously on quite a different level from the suggestion that I am judging it really to be an inkstand. It is not childishly obvious that I am not judging it to be part of the surface of an inkstand, as it is that I am not judging it to be an inkstand--a whole one.

On this view, when I say such things as "That is an inkstand," "That is a door," "This is a coin," these expressions would really only be a loose way of saying "That is part of the surface of an inkstand," "That is part of the surface of a door," "This is part of the surface of a coin." And there would, I think, plainly be nothing surprising in the fact that we should use language thus loosely. What, at first sight, appears to be a paradox, namely that, whereas I appear to be asserting of a given thing that it is of a certain kind, I am not really asserting of the thing in question that it is of that kind at all, would be susceptible of an easy explanation. And moreover, if this view were true, it would offer an excellent illustration of the difference between a thing known only by description and a thing not so known, and would show how entirely free from mystery that distinction is. On this view, when I judge "That inkstand is a good big one" I shall in effect be judging: "There is one and only one inkstand of which _this_ is part of the surface, and the inkstand of which this is true is a good big one." It would be quite clear that the part of the surface of the inkstand was given to me in a sense in which the whole was not, just as it is in fact clear that I do now _"see"_ this part of the surface of this inkstand, in a sense in which I do _not_ "see" the whole; and that my judgment, while it is, in fact, _about_ both the whole inkstand, and also _about_ one particular part of its surface, is _about_ them in two entirely different senses.

This view is one, which it is at first sight, I think, very natural to suppose to be true. But before giving the reasons, why, nevertheless, it seems to me extremely doubtful, I think it is desirable to try to explain more precisely what I mean by it. The word "part" is one which is often used extremely vaguely in philosophy; and I can imagine that some people would be willing to assent to the proposition that this sense-datum really is, in some sense or other, a "part" of this inkstand, and that what I am judging with regard to it, when I judge "This is an inkstand," is, in effect, "There is an inkstand, of which _this_ is a part," who would be far from allowing that this can possibly be what I am judging, when once they understand what the sense is in which I am here using the word "part." What this sense is, I am quite unable to define; but I hope I may be able to make my meaning sufficiently clear, by giving instances of things which are undoubtedly "parts" of other things in the sense in question. There is, it seems to me, a sense of the word "part," in which we all constantly use the word with perfect precision, and, which, therefore, we all understand very well, however little we may be able to define it. It is the sense in which the trunk of any tree is undoubtedly a part of that tree; in which this finger of mine is undoubtedly a part of my hand, and my hand a part of my body. This is a sense in which every part of a material thing or physical object is itself a material thing or physical object; and it is, so far as I can see, the only proper sense in which a material thing can be said to have parts. The view which I wish to discuss is the view that I am judging this presented object to be a part of an inkstand, in this sense. And the nature of the view can perhaps be brought out more clearly, by mentioning one important corollary which would follow from it. I am, of course, at this moment, seeing many parts of the surface of this inkstand. But all these parts, except one, are, in fact, themselves parts of that one. That one is the one of which we should naturally speak as "_the_ part of the surface that I am now seeing" or as "_this_ part of the surface of this inkstand." There is only one part of the surface of this inkstand, which does thus contain, as parts, all the other parts that I am now seeing. And, if it were true that I am judging this presented object to be a part of the surface of an inkstand at all, in the sense I mean, it would follow that this presented object must, if my judgment "This is an inkstand" be true (as it certainly is), be identical with this part, which contains all the other parts which I am seeing; since there is plainly no other part with which it could possibly be identified. That is to say, if I am really judging of this presented object that it is part of the surface of an inkstand, in the sense I mean, it must be the case that everything which is true of what I should call "this part of the surface of this inkstand" is, in fact, true of this presented object.

This view, therefore, that what we are judging of the ultimate subject of our judgment, when we judge "This is a so-and-so," is, in general, merely that the subject in question is a _part_ of a thing of the kind in question, can, I think, be most clearly discussed, by asking whether, in this case, this presented object can really be identical with this part of the surface of this inkstand. If it can't, then most certainly I am not judging of it that it is a part of the surface of an inkstand at all. For my judgment, whatever it is, is true. And yet, if this presented object is not identical with this part of the surface of this inkstand, it certainly is not a part of an inkstand at all; since there is no other part, either of this inkstand or of any other, with which it could possibly be supposed to be identical.

Can we, then, hold that this sense-datum really is identical with this part of the surface of this inkstand? That everything which is true of the one is true of the other?