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by means of the sense-data--brown colour, oblong shape, smoothness, |
etc.--which we associate with the table; but, for the reasons which have |
been given, we cannot say that the table is the sense-data, or even |
that the sense-data are directly properties of the table. Thus a problem |
arises as to the relation of the sense-data to the real table, supposing |
there is such a thing. |
The real table, if it exists, we will call a 'physical object'. Thus |
we have to consider the relation of sense-data to physical objects. |
The collection of all physical objects is called 'matter'. Thus our two |
questions may be re-stated as follows: (1) Is there any such thing as |
matter? (2) If so, what is its nature? |
The philosopher who first brought prominently forward the reasons |
for regarding the immediate objects of our senses as not existing |
independently of us was Bishop Berkeley (1685-1753). His _Three |
Dialogues between Hylas and Philonous, in Opposition to Sceptics and |
Atheists_, undertake to prove that there is no such thing as matter at |
all, and that the world consists of nothing but minds and their ideas. |
Hylas has hitherto believed in matter, but he is no match for Philonous, |
who mercilessly drives him into contradictions and paradoxes, and makes |
his own denial of matter seem, in the end, as if it were almost common |
sense. The arguments employed are of very different value: some are |
important and sound, others are confused or quibbling. But Berkeley |
retains the merit of having shown that the existence of matter is |
capable of being denied without absurdity, and that if there are any |
things that exist independently of us they cannot be the immediate |
objects of our sensations. |
There are two different questions involved when we ask whether matter |
exists, and it is important to keep them clear. We commonly mean by |
'matter' something which is opposed to 'mind', something which we think |
of as occupying space and as radically incapable of any sort of thought |
or consciousness. It is chiefly in this sense that Berkeley denies |
matter; that is to say, he does not deny that the sense-data which we |
commonly take as signs of the existence of the table are really signs |
of the existence of _something_ independent of us, but he does deny |
that this something is non-mental, that it is neither mind nor ideas |
entertained by some mind. He admits that there must be something which |
continues to exist when we go out of the room or shut our eyes, and that |
what we call seeing the table does really give us reason for believing |
in something which persists even when we are not seeing it. But he |
thinks that this something cannot be radically different in nature from |
what we see, and cannot be independent of seeing altogether, though it |
must be independent of _our_ seeing. He is thus led to regard the 'real' |
table as an idea in the mind of God. Such an idea has the required |
permanence and independence of ourselves, without being--as matter would |
otherwise be--something quite unknowable, in the sense that we can only |
infer it, and can never be directly and immediately aware of it. |
Other philosophers since Berkeley have also held that, although the |
table does not depend for its existence upon being seen by me, it does |
depend upon being seen (or otherwise apprehended in sensation) by |
_some_ mind--not necessarily the mind of God, but more often the whole |
collective mind of the universe. This they hold, as Berkeley does, |
chiefly because they think there can be nothing real--or at any rate |
nothing known to be real except minds and their thoughts and feelings. |
We might state the argument by which they support their view in some |
such way as this: 'Whatever can be thought of is an idea in the mind of |
the person thinking of it; therefore nothing can be thought of except |
ideas in minds; therefore anything else is inconceivable, and what is |
inconceivable cannot exist.' |
Such an argument, in my opinion, is fallacious; and of course those who |
advance it do not put it so shortly or so crudely. But whether valid or |
not, the argument has been very widely advanced in one form or another; |
and very many philosophers, perhaps a majority, have held that there is |
nothing real except minds and their ideas. Such philosophers are called |
'idealists'. When they come to explaining matter, they either say, like |
Berkeley, that matter is really nothing but a collection of ideas, |
or they say, like Leibniz (1646-1716), that what appears as matter is |
really a collection of more or less rudimentary minds. |
But these philosophers, though they deny matter as opposed to mind, |
nevertheless, in another sense, admit matter. It will be remembered that |
we asked two questions; namely, (1) Is there a real table at all? (2) If |
so, what sort of object can it be? Now both Berkeley and Leibniz admit |
that there is a real table, but Berkeley says it is certain ideas in the |
mind of God, and Leibniz says it is a colony of souls. Thus both of them |
answer our first question in the affirmative, and only diverge from the |
views of ordinary mortals in their answer to our second question. In |
fact, almost all philosophers seem to be agreed that there is a real |
table: they almost all agree that, however much our sense-data--colour, |
shape, smoothness, etc.--may depend upon us, yet their occurrence is |
a sign of something existing independently of us, something differing, |
perhaps, completely from our sense-data, and yet to be regarded as |
causing those sense-data whenever we are in a suitable relation to the |
real table. |
Now obviously this point in which the philosophers are agreed--the view |
that there _is_ a real table, whatever its nature may be--is vitally |
important, and it will be worth while to consider what reasons there are |
for accepting this view before we go on to the further question as |
to the nature of the real table. Our next chapter, therefore, will be |
concerned with the reasons for supposing that there is a real table at |
all. |
Before we go farther it will be well to consider for a moment what it |
is that we have discovered so far. It has appeared that, if we take any |
common object of the sort that is supposed to be known by the senses, |
Subsets and Splits