Here the demonstrative phrase or the gesture, which demonstrates the 'it' which is commodious, has now been reduced to 'this'; and the attenuated phrase, under the circumstances in which it is uttered, is sufficient for the purpose of correct demonstration. This brings out the point that the verbal form is never the whole phraseology of the proposition; this phraseology also includes the general circumstances of its production. Thus the aim of a demonstrative phrase is to exhibit a definite 'it' as a bare objective for thought; but the _modus operandi_ of a demonstrative phrase is to produce an awareness of the entity as a particular relatum in an auxiliary complex, chosen merely for the sake of the speculative demonstration and irrelevant to the proposition. For example, in the above dialogue, colleges and buildings, as related to the 'it' speculatively demonstrated by the phrase 'this college building,' set that 'it' in an auxiliary complex which is irrelevant to the proposition 'It is commodious.' Of course in language every phrase is invariably highly elliptical. Accordingly the sentence 'This college building is commodious' means probably 'This college building is commodious as a college building.' But it will be found that in the above discussion we can replace 'commodious' by 'commodious as a college building' without altering our conclusion; though we can guess that the recipient, who thought he was in the lion-house of the Zoo, would be less likely to assent to. 'Anyhow, it is commodious as a college building.' A more obvious instance of elliptical phraseology arises if the expositor should address the recipient with the remark, 'That criminal is your friend.' The recipient might answer, 'He is my friend and you are insulting.' Here the recipient assumes that the phrase 'That criminal' is elliptical and not merely demonstrative. In fact, pure demonstration is impossible though it is the ideal of thought. This practical impossibility of pure demonstration is a difficulty which arises in the communication of thought and in the retention of thought. Namely, a proposition about a particular factor in nature can neither be expressed to others nor retained for repeated consideration without the aid of auxiliary complexes which are irrelevant to it. I now pass to descriptive phrases. The expositor says, 'A college in Regent's Park is commodious.' The recipient knows Regent's Park well. The phrase 'A college in Regent's Park' is descriptive for him. If its phraseology is not elliptical, which in ordinary life it certainly will be in some way or other, this proposition simply means, 'There is an entity which is a college building in Regent's Park and is commodious.' If the recipient rejoins, 'The lion-house in the Zoo is the only commodious building in Regent's Park,' he now contradicts the expositor, on the assumption that a lion-house in a Zoo is not a college building.