Dream and Civilization.—The function of the brain which is most encroached upon in slumber is the memory; not that it is wholly suspended, but it is reduced to a state of imperfection as, in primitive ages of mankind, was probably the case with everyone, whether waking or sleeping. Uncontrolled and entangled as it is, it perpetually confuses things as a result of the most trifling similarities, yet in the same mental confusion and lack of control the nations invented their mythologies, while nowadays travelers habitually observe how prone the savage is to forgetfulness, how his mind, after the least exertion of memory, begins to wander and lose itself until finally he utters falsehood and nonsense from sheer exhaustion. Yet, in dreams, we all resemble this savage. Inadequacy of distinction and error of comparison are the basis of the preposterous things we do and say in dreams, so that when we clearly recall a dream we are startled that so much idiocy lurks within us. The absolute distinctness of all dream-images, due to implicit faith in their substantial reality, recalls the conditions in which earlier mankind were placed, for whom hallucinations had extraordinary vividness, entire communities and even entire nations laboring simultaneously under them. Therefore: in sleep and in dream we make the pilgrimage of early mankind over again.