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If we were to deny all that is not accessible to the senses, then we would be forced to deny realities which undoubtedly exist. For example, the ether is not sensible, although its reality can be proven. The power of gravity is not sensible, although its existence is likewise undeniable. Whence do we affirm their existence? From their signs. For instance, this light consists in the vibrations of the ether, and from these vibrations we infer its existence
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