204. Before we can picture to ourselves how that mass of consciousness may disintegrate, we ought, were it possible, to picture to ourselves how it is in the first instance integrated. That, however, is a difficulty which does not begin with the constitution of man. It begins when unicellular develop into multicellular organisms. It is, of course, a mystery how a single cell can hold together, and what kind of unity it can possess. But it is a fresh mystery when several cells cohere in a conjoint and independent life. In the collective unity of certain "colonial animals" we have a kind of sketch or parody of our own complex being. Higher intelligences may possibly see us as we see the hydrozoon - a creature split up into different "persons," a "hydriform person " who feeds, a "medusi-form person " who propagates, and so on - elements of the animal differentiated for different ends - interconnected from one point of view as closely as our stomach and brain, yet from another point of view separable existences, capable of detachment and of independent regeneration in all kinds of different ways.

Still more composite, though less conspicuously composite, is every animal that we meet as we rise through the scale; and in man we reach the summit both of colonial complexity and of centralised control.

I need hardly say that as regards the inner nature of this close coordination, this central government, science can at present tell us little or nothing. The growth of the nervous mechanism may be to some extent deciphered; but how this mechanism is centrally governed; what is the tendency which makes for unity; where precisely this unity resides, and what is its exact relation to the various parts of the multicellular organism all these are problems in the nature of life, to which as yet no solution is known.

The needed clue, as I believe, can be afforded only by the discovery of laws affecting primarily that unseen or spiritual plane of being where I imagine the origin of life to lie. If we can suppose telepathy to be a first indication of a law of this type, and to occupy in the spiritual world some such place as gravitation occupies in the material world, we might imagine something analogous to the force of cohesion as operating in the psychical contexture of a human personality. Such a personality, at any rate, as the development of higher from lower organisms shows, involves the aggregation of countless minor psychical entities, whose characteristics still persist, although in a manner consistent with the possibility that one larger psychical entity, whether pre-existent or otherwise, is the unifying continuum of which those smaller entities are fragments, and exercises over them a pervading, though an incomplete, control.

205. It is plainly impossible to say beforehand what will be the relation to the ordinary stream of consciousness of a personality thus composed. We have no right to assume that all our psychical operations will fall at the same time, or at any time, into the same central current of perception, or rise above what we have called the ordinary conscious threshold. We can be sure, in fact, that there will be much which will not so rise; can we predict what will rise ?

We can only reply that the perception of stimuli by the supraliminal consciousness is a kind of exercise of function; and that here, as in other cases where a function is exercised, part of its range will consist of such operation as the primary structure of the organism obliges it to perform, and part will consist of such operation as natural selection (after the structure has come into being) has trained it to perform. There will be something which is structurally inevitable, and something which was not structurally inevitable, but which has proved itself practically advantageous.

Thus it may be inevitable - a necessary result of nervous structure - that consciousness should accompany unfamiliar cerebral combinations; - that the "fraying of fresh channels" should carry with it a perceptible tingle of novelty. Or it is possible, again, that this vivid consciousness of new cerebral combinations may be a later acquisition, and merely due to the obvious advantage of preventing new achievements from stereotyping themselves before they have been thoroughly practised; - as a musician will keep his attention fixed on a difficult novelty, lest his execution should become automatic before he has learnt to render the piece as he desires. It seems likely, at any rate, that the greater part of the contents of our supraliminal consciousness may be determined in some such fashion as this, by natural selection so operating as to keep ready at hand those perceptions which are most needed for the conduct of life.

The notion of the upbuilding of the personality here briefly given is of use, I think, in suggesting its practical tendencies to dissolution. Subjected continually to both internal and external stress and strain, its ways of yielding indicate the grain of its texture.