great coconscious field where they would continue their existence in specific form as ideas, and whence they could be drawn upon for use at any future time. Various difficulties are raised by this hypothesis. In the first place, there is no evidence that coconscious ideas have a continuous existence. The technical methods of investigation which give evidence of such ideas functioning outside of the awareness of the personal consciousness do not show that at any given moment they are any more extensive than are those which fill the field of the personal consciousness. Indeed, usually, the coconscious field is of very limited extent. There remains an enormous field of conserved experiences to be accounted for. So far then as coconscious ideas can be discovered by our methods of investigation they are _inadequate to account for the whole of the conservation of life’s experiences_. In the second place, these ideas come and go in the same fashion as do those which make up the content of the main personal consciousness; and many are constantly recurring to become coconscious memories. The same problem, of the nature of conservation, therefore confronts us with coconscious ideas in the determination of the mechanism of coconscious memory. To explain conservation through coconscious ideas is but a shifting of the problem. If a broader concept be maintained, namely, that this coconsciousness, which can be demonstrated in special conditions, is but a fraction of the sum total of coconscious ideas outside of the personal awareness, we are confronted with a concept which from its philosophical nature deals with postulates beyond experience. We can neither prove nor disprove it. There is much that can be said in its support for the deeper we dive into the subconscious regions of the mind the more extensively do we come across evidences of coconscious states underlying specific phenomena. Nevertheless, the demonstration of coconscious states in any number of specific phenomena does not touch the problem of the nature of conservation. In weighing the probability of the hypothesis on theoretical grounds it would seem, as I have already said in a preceding lecture, to be hardly conceivable that ideas that had passed out of mind, the thoughts of the moment of which we are no longer aware, can be treasured, conserved as such in a sort of psychological storehouse or reservoir of consciousness, just as if they were static or material facts. Such a conception would require that every specific state of consciousness, every idea, every thought, perception, sensation and feeling, after it had passed out of mind for the moment, should enter a great sea of ideas which would be the sum total of all our past experiences. In this sum-total millions of ideas would have to be conserved _in concrete_ form until wanted again for use by the personal consciousness of the moment. Here would be found, in what you will see at once would be a real subconscious mind beyond the