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The materialist who would confine all experience to sense-experience can no longer get away with such an antiquated argument. Without the instruments which convert these radiations into sights or sounds, his senses do not ordinarily tell him that infra-red and ultraviolet rays exist, for instance. This statement rests upon verifiable fact, not upon fanciful speculation.
-- Notebooks Category 21: Mentalism > Chapter 1 : The Sensed World > # 42