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 the lower human races and dreams.20 This train of thought is not a strange one for us, but quite familiar through our knowledge of comparative anatomy and the history of development, which show us how the structure and function of the human body are the results of a series of embryonic changes which correspond to similar changes in the history of the race. Therefore, the supposition is justified that ontogenesis corresponds in psychology to phylogenesis. Consequently, it would be true, as well, that the state of infantile thinking in the child's psychic life, as well as in dreams, is nothing but a re-echo of the prehistoric and the ancient.21

In regard to this, Nietzsche takes a very broad and remarkable standpoint.22

"In our sleep and in our dreams we pass through the whole thought of earlier humanity. I mean, in the same way that man reasons in his dreams, he reasoned when in the waking state many thousands of years. The first causa which occurred to his mind in reference to anything that needed explanation, satisfied him and passed for truth. In the dream this atavistic relic of humanity manifests its existence within us, for it is the foundation upon which the higher rational faculty developed, and which is still developing in every individual. The dream carries us back into earlier states of human culture, and affords us a means of understanding it better. The dream thought is so easy to us now, because we are so thoroughly trained to it through the interminable stages of evolution during which this phantastic and facile form of theorizing has prevailed. To a certain extent the dream is a restorative for the brain, which during the day is called upon to meet the severe demands for trained thought, made by the conditions of a higher civilization.

"From these facts, we can understand how lately more acute logical thinking, the taking seriously of cause and effect, has been