 So far the argument has been conducted in terms of an ‘I’ not essentially related to body or related only to an inert body. At §269, however, it moves to examples where there is bodily behaviour but despite this there is still the temptation to think of private meanings for words independent of their public use. This suggests a further chance for a defender of the idea of a private language: that a private linguist might secure a meaning for his sign ‘S’ by correlating its private use with some public phenomenon. This would apparently serve to provide a function for the noting of ‘S’ in the diary (§260) and thus give a place for ostensive definition, and would give as well a guarantee that there is some constancy in the linguist’s use of the term ‘S’ independent of his impression of such constancy. Wittgenstein uses the example of the manometer in §§270–271 to consider this idea, and his criticism of it is in effect that this method of securing meaning works, but that the secured meaning is public: the so-called “private object”, even if there were such a thing, is revealed to be irrelevant to meaning. Presumably a defender of “private language” would hope that the example would work like this: if I keep saying, on the basis of my sensation, that my blood pressure is rising, and the manometer shows that I am right, then this success in judging my own blood pressure shows that I had in fact established a private meaning for the sign ‘S’ and was using the sign in the same way each time to judge that my sensation was the same each time. However, all the example really shows is that just thinking that I have the same sensation now as I had when my blood pressure rose formerly, can be a good guide to the rising of my blood pressure. Whether in some “private sense” the sensation was “actually the same” or not becomes completely irrelevant to the question of constancy in the use of ‘S’—that is, there is no gap between the actual nature of the sensation and my impression of it, and ‘S’ in this case could mean merely ‘sensation of the rising of the blood pressure’; indeed, for all we are told of the sign’s role, it could even mean just ‘blood pressure rising’.