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 of brain-stuff, when I turned suddenly to the door and greeted an imaginary person outside ? Instantly, out of the thousands of observations stored in his brain, came to the front of his consciousness the particular observations connected with this particular situation. Next, he established a relation between these observations. This relation was his conclusion, achieved, as every psychologist will agree, by a definite cell-action of his gray matter. From the fact that his master turned suddenly toward the door, and from the fact that his master's voice, facial expression, and whole demeanor expressed surprise and delight, he concluded that a friend was outside. He established a relation between various things, and the act of establishing relations between things is an act of reason — of rudimentary reason, granted, but none the less of reason.

Of course Rollo was fooled. But that is no call for us to throw chests about it. How often has every last one of us been fooled in precisely similar fashion by another who turned and suddenly addressed an imaginary intruder? Here is a case in point that occurred in the West. A robber had held up a railroad train. He stood in the aisle between the seats,