In these cases, the memory of the facts is connected with that of the atoms which register it; this memory can only be recalled by coming into contact with these atoms.[255]

There is also another memory, midway between the unconscious memory of atoms and the conscious memory of the human soul; that of the forms of the various sub-human kingdoms. It is only slightly conscious, for it is not individualised; all the same, it is precise in its nature. It dwells in the vital essence of the form, an essence taken from a collective "block" which supplies a portion of its substance to the individuals of the same species; this incarnate portion of essence, when the form disintegrates at death, returns to the parent "block," to which it communicates the result of its experiences, and when the latter sends out a portion of itself, into a new form, this tentacle, which is, so to speak, the soul of the form, is in possession of the whole of the experiences of the "block."[256] This explains how it is that the individual members of certain hostile species know one another from birth—the chicken, for instance, which, immediately it has left the egg, trembles before the hawk hovering above in the air; such is also the reason why a duckling plunges into water as soon as it comes to a pond, and the same instinct impels a bird to leave its nest and trust itself to the air when fully fledged.

In these collective souls, belonging to the mineral, vegetable, and animal kingdoms, there can be recovered the past to which they bore witness, when the atoms of their bodies have been dispersed and entered into new combinations.

When the elemental Essence[257] has definitely split up, and the "blocks" have become separate, individualised, human fragments,[258] each of these fragments is a causal body, a definite, immortal centre in the total Centre. Consequently there are in man three kinds of memory: atomic memory, that of the atoms of his bodies; instinctive memory of the special elemental essences which are the collective souls of his various vehicles; and finally, the individual memory of the centre,[259] which is one with the total Centre from which it comes.

This element of unity, this human "I" in the divine "I," when sufficiently developed, is able to evoke the memory of all the events in which it has participated in the causal body, and also the memory of those it has witnessed as a collective soul (elemental "block") in bygone ages when active in various mineral, vegetable, and animal species. As a centre in the great Centre, it can also call forth the memory of everything in the Universe that its consciousness can grasp.[260] And when, in this long pilgrimage, it has developed to the farthest limits of the Universe it knows all that has been, is now, and is to be in this Universe, consequently it knows both what it has and what it has not participated in, for everything in the Universe has then become part of itself.

Thus it is seen that the memory of the past is everywhere registered, and that the difficulty a man has in bringing it back is caused by nothing more than his imperfect development. Once he has entered the "Strait Gate,"[261] and his consciousness is awake on the first plane of Unity,[262] he becomes able to read the Great Book of Nature, in which all vibrations are kept in potentiality; he can revive them by an effort of will, similar to that he makes in a waking state, when he wishes to bring back past impressions to his brain. The difference lies in the fact that, in the latter case, being in the physical body, he calls up the memory retained in the astral body; whilst in the former case, being in the causal body, he brings memory within the influence of the buddhic body, or even at times of higher bodies still. The more the Being grows, and becomes able to fix his consciousness on the higher planes, the wider extends his sphere of influence, approaching that of divine Consciousness.

It is ignorance that brings forward this objection regarding loss of memory, ignorance of life and of death, ignorance of the phenomena that follow the last breath of a dying man, as well as of those preceding the first faint cry of a new-born child. Sceptics, however, might have shown a little more indulgence, for, as they are well aware, ordinary memory is even now so unreliable that a man has great difficulty in recalling the whole of the thoughts that have entered his brain during the last few minutes; he has forgotten the details of the various events of the week; the facts of the past year have mostly vanished from his mind, and when he comes to the end of the journey, mere fragments of the story of his life are all that is left. For all that, he has all the time retained the notion of the identity of his "I"; he has the same body, the same senses, and the same brain; his environment is the same; everything is there to bring about association of ideas, to awaken memory. On the other hand, centuries have elapsed before Rebirth takes place; the human being has undergone the most radical changes and modifications; everything in him that was perishable has disappeared, and is preserved only in a germinal state. The visible bodily sheath has had its atoms scattered to the four elements; the etheric body[263] has become separated from the physical molecules whose vital support it formed; the body of passions and desires (astral body) has lived for a few years in what Catholics call Purgatory, Greeks, Hades, and Hindus, Kâmaloka; after which, only germs have been left behind; then the intelligence (mental body) has been dispersed in turn and endures only in a germinal state. Almost everything that made up the man of bygone times has disappeared, and is now concentrated in a complex germ hidden away in the causal body and destined to develop a new personality later on,[264] heir to the former one, though it will not be capable of remembering events in which it took no part.

This is the explanation of the myth of Lethe.

The soul, in the causal body, drinks of the river of Life, and from its sleep-giving draught forms the sheaths of the new incarnation, the new bodies that altogether blot out the memory of the past; it is, in very truth, a new-born babe who appears on earth.