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 propositions are reached. Out of the propositions which I have shown were Glen's, and which had become his through the medium of his own observation of the phenomena of life, he made the new proposition that when the horn tooted it was time for him to get on board.

But on the morning I have described, the chauffeur fooled Glen. Somehow, and much to his own disgust, his reasoning was erroneous. The machine did not start after all. But to reason incorrectly is very human. The great trouble in all acts of reasoning is to include all the propositions in the problem. Glen had included every proposition but one, namely, the human proposition, the joke in the brain of the chauffeur. For a number of times Glen was fooled. Then he performed another mental act. In his problem he included the human proposition (the joke in the brain of the chauffeur), and he reached the new conclusion that when the horn tooted the automobile was not going to start. Basing his action on this conclusion, he remained on the porch and finished his breakfast. You and I, and even Mr. Burroughs, perform acts of reasoning precisely similar to this every day in our lives. How Mr. Burroughs