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with revelation, an outer voice, which takes hold on inner powers, and gives steadfastness and certainty to their conclusion. The mind is not left alone to travel these outlying highways of thought.

In this growth of knowledge through science, philosophy and theology, deduction and induction play intermingled and inseparable parts. Deduction from necessary ideas, from definitions and axioms intuitively conceived under them, gives us first principles, the ever present instruments of inquiry. Induction is nothing without a theory, a conception of some sort, running side by side with its classifications, guiding and interpreting them, and ready deductively to furnish shining strokes of exposition. The theory with its derived conclusions is most impotent and misleading, save as induction presides at the birth and growth of it. The wise mind is always laying up the facts of nature, like stones in a building; but laying them up under a plan which it has caught by penetrating beneath the surface; by interpreting signs and relations unintelligible to the merely physical eye. Here, then, in the growth of general knowledge, we have the counterpart of that which we find in the individual mind. The elaborative faculty, the understanding, is ever playing between the sensations and the intuitions, weaving them into a rational experience. In like manner the philosophy and the science of the world are bringing downward, deductively, the theories of the mind; are bringing upward, inductively, the phenomena of nature and mind, and slowly uniting them into one compact web of knowledge; the exposition running as light through the facts, and the facts embodying and presenting the exposition. The one process is as necessary as the other, the woof as the warp.

Lesson 63 - 3. Sensation Judgment Reasoning - p.283

3. We wish to mark briefly the means by which the mind advances in acquisition the instruments of intellectual