Some dabbling there has been, with results of little more value than were the contents of the greasy, bethumbed dream-books of the eighteenth-century milkmaid or apprentice. The labour bestowed upon the matter has been mainly directed to efforts to prove the extreme rapidity with which dreams pass through the mind, and that it is some trivial outward cause at the very instant of awakening—such as a noise, a light, or a blow—which rouses the brain to this miraculous celerity of imaginative creation.
The persistent assertion that a dream occurs only at the moment of awakening shows how little real attention has been given to the matter, since the most casual observation of "the dog that hunts in dreams" would have shown that he may be "chasing the wild deer and following the roe" in the grey Kingdom of Seeming without breaking his slumbers. He will start and twitch, and give tongue after the phantom quarry he dreams he is pursuing, and yet continue his sleep without an interval. But have it whichever way one likes, the heart of the mystery is not yet discovered. How do they explain why a noise or a gleam of light—such as the waking senses know familiarly—should at this magical moment of rousing cause the brain to create with inconceivable rapidity a crowd of phantasmagoria in order to explain to itself the familiar phenomena of light and sound?
Dr. Friederich Scholz, in his recent volume upon "Sleep and Dreams," gives an example of rapid effort of the mind to explain the sensations felt by the sleeping body:
"I dreamed of the Reign of Terror, saw scenes of blood and murder, appealed before the Revolutionary Tribunal, saw Robespierre, Marat, Fouquier-Tinville, all the personages of that time of horrors, argued with them, was finally, after a number of occurrences, condemned to death, was carried to the place of execution on a cart through enormous masses of people, was bound by the executioner to the board. The knife fell and I felt my head severed from my body. Thereupon I awoke and found that a loosened rod of the bed had fallen on my neck like the knife of the guillotine, and this had happened, my mother assured me, at the very moment when I awoke."...
That the mind should, merely because of the body's sleep, be able to create a whole scene of a terrible drama with a rapidity impossible when all the functions are awake and active is incredible. The only function of the brain capable of this lightning-like swiftness of vision is memory. To create requires a certain effort, consumes a certain period of time, but a scene once beheld, an adventure once experienced and vividly impressed upon the memory, can be recalled in its minutest details in a period of time too short to be reckonable.
That the sensitive plate of the brain never loses any clear picture once received, has been demonstrated beyond doubt. The picture, the sensation, may be overlaid and hidden for a long time beneath the heaps of useless lumber that the days and years accumulate in the mind's storehouse, but need or accident, or a similarity of circumstance, will bring the forgotten belonging to light—sometimes with startling effect. There is the well-known instance of a girl who, during an attack of fever delirium, spoke in a language that no one about her could understand. Investigation proved it to be Welsh—a language of which, both before and after her illness, she was totally ignorant. Further investigation showed that being born in Wales she had understood the tongue as a very little child, but had afterwards completely forgotten it.
It is commonly known that in the struggle of the body against death by water, the memory, stirred to furious effort, produces all her stores at once—probably in the frantic endeavour to find some experience which may be of use in this crisis.
It is often broadly asserted that the memory retains each and every experience which life has presented for its contemplation, but this is hardly true. The memory makes to a certain extent a choice, and chooses oftentimes with apparent caprice. To demonstrate the truth of this, let one endeavour to recall the first impression retained by his childish mind and it usually proves to be something extremely trivial. My own first clear memory is a sense of the comfort to my tired little two-year-old body of the clean linen sheets of the bed at the end of a perilous and adventurous journey, of whose startling incidents my memory preserved only one. Often this capricious faculty will seize upon some few high lights in a vivid picture and reject all the unimportant details. As a rule, however, it is the profound stirring of the emotions which wakes the memory to activity. A woman never forgets her first lover. A man to the end of his life can recall his first triumph, or his most imminent danger, and a trifle will often, after the lapse of half a century, fill the eye with tears, make the cheek burn, or the heart beat with the power of the long-passed emotion, preserved living and fresh by the memory.