Now, should we say that the proposition, “B can continue the series”, means that one of the occurrences just described takes place? Isn't it clear that the statement, “B can continue … ”
57.
is not the same as the statement that the formula an = n2 + n ‒ 1 comes into B's mind? This occurrence might have been all that actually took place. (It is clear, by the way, that it can make no difference to us here whether B has the experience of this formula appearing before his mind's eye, or the experience of writing or speaking the formula, or of picking it out with his eyes from amongst several formulae written down beforehand.) If a parrot had uttered the formula, we should not have said that he could continue the series. ‒ ‒ Therefore, we are inclined to say “to be able to … ” must mean more than just uttering the formula, – – and in fact more than any one of the occurrences we have described. And this, we go on, shows that saying the formula was only a symptom of B's being able to go on, and that it was not the ability of going on itself. Now what is misleading in this is that we seem to intimate that there is one peculiar activity, process, or state called “being able to go on” which somehow is hidden from our eyes but manifests itself in these occurrents which we call symptoms (as an inflammation of the mucous membranes of the nose produces the symptom of sneezing). This is the way talking of symptoms, in this case, misleads us. When we say, “Surely there must be something else behind the mere uttering of the formula, as this alone we should not call ‘being able to … ’”, the word “behind” here is certainly used metaphorically, and “behind” the utterance of the formula may be the circumstances under which it is uttered. It is true, “B can continue … ” is not the same as to say, “B says the formula … ”, but it
58.
doesn't follow from this that the expression, “B can continue … ” refers to an activity other than that of saying the formula, in the way in which “B says the formula” refers to the well-known activity. The error we are in is analogous to this: Someone is told the word “chair” does not mean this particular chair I am pointing to, upon which he looks round the room for the object which the word “chair” does denote. (The case would be even more a striking illustration if he tried to look inside the chair in order to find the real meaning of the word “chair”.) It is clear that when with reference to the act of writing or speaking the formula etc., we use the sentence, “He can continue the series”, this must be because of some connection between writing down a formula and actually continuing the series. And the connection in experience of these two processes or activities is clear enough. But this connection tempts us to suggest that the sentence, “B can continue … ” means something like, “B does something which, experience has shown us, generally leads to his continuing the series.” But does B, when he says, “Now I can go on” really mean, “Now I am doing something which, as experience has shown us, etc., etc.”? Do you mean that he had this phrase in his mind or that he would have been prepared to give it as an explanation of what he had said?! To say the phrase, “B can continue … ” is correctly used when prompted by such occurrences as described in 62), 63), 64) but that these occurrences justify its use only under certain circumstances (e.g. when experience has shown certain connections) is not to say that the sentence, “B can continue … ”
59.
is short for the sentence which describes all these circumstances, i.e. the whole situation which is the background of our game.