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Liebig described his Organic Chemistry as an application of ideas found in Mill's Logic, and a distinguished physician, not to be named lest he should overhear me, read three books to enlarge his medical mind; and they were Gibbon, Grote, and Mill. He goes on to say, " An educated man cannot become so on one study alone, but must be brought under the influence of natural, civil, and moral modes of thought."^[71] I quote my colleague's golden words in order to reciprocate them. If men of science owe anything to us, we may learn much from them that is essential.^[72] For they can show how to test proof, how to secure fulness and soundness in induction, how to restrain and to employ with safety hypothesis and analogy. It is they who hold the secret of the mysterious property of the mind by which error ministers to