"Matter makes itself known to us by the testimony of...

"Matter makes itself known to us by the testimony of the senses. We see it, hear it, smell it, taste it, touch it. But observe, that, after all, this is indirect testimony. These impressions are all of them simply brain impressions. We see, hear, smell, taste, touch, in our consciousness only. We cannot assert therefore that matter exists apart from this consciousness. Science has nothing to say about the ultimate nature of matter. Science studies matter simply as a fact of human experience."

"We are not concerned in physics with what things really are, but solely with their properties and behavior. Physics neither offers nor seeks an explanation of the universe. It leaves all such problems to metaphysics." From the text-book on physics by Henderson and Wood-hull of Columbia University.

January 30, 1909

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