Now it is clear that the logical consequences of the subjectivist doctrine are so subversive of all the practical assumptions upon which daily life is based, that they should require the most stringent proof before we give our assent to them. If Subjectivism is true, it follows immediately that not merely the “whole choir of heaven and furniture of earth,” but the whole of humanity, so far as I have any knowledge of its existence, is a mere subjective affection of my own “consciousness,” or, as the scientific subjectivist usually, for some not very obvious reason, prefers to say, of my own brain. Every argument which the subjectivist can produce to show that “things” are, for my knowledge at any rate, “modifications of my own consciousness,” applies to the case of my fellow-men with as much force as to the case of the inorganic world. The logical inference from the subjectivist’s premisses, an inference which he is rarely or never willing to draw, would be that he is himself the sole real being in a world of phantoms, not one of which can with any certainty be said to correspond to a real object. And conversely, any valid ground for recognising the existence of my fellow-men as more than “states of my own consciousness,” must equally afford ground for admitting the reality, in the same general sense, of the rest of the world of things familiar to us from the experiences of everyday life.[50] For if any one of the things composing the world of practical life has a reality which is not dependent upon its presence to my particular experience, then there is the same reason for believing that every other such thing has a like reality, unless there happen to be special grounds for regarding the perception to which it is present as an hallucination. We must not, however, simply dismiss the subjectivist theory in this summary way. We must examine the doctrine in detail sufficiently to discover where the fallacy comes in, how it arises, and what modicum of sound philosophic insight it may possibly contain. To take these three points in logical order—