We say that we often see animals in our dreams, but we forget that almost always we are ourselves animals therein, deprived of that reasoning power which projects upon things the light of certainty; on the contrary we bring to bear on the spectacle of life only a dubious vision, extinguished anew every moment by oblivion, the former reality fading before that which follows it as one projection of a magic lantern fades before the next as we change the slide.