Like all positive affections of consciousness, the sense of reality has its negative counterpart in the shape of a feeling of unreality by which persons may be haunted, and of which one sometimes hears complaint:— "When I reflect on the fact that I have made my appearance by accident upon a globe itself whirled through space as the sport of the catastrophes of the heavens," says Madame Ackermann; "when I see myself surrounded by beings as ephemeral and incomprehensible as I am myself, and all excitedly pursuing pure chimeras, I experience a strange feeling of being in a dream. It seems to me
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