Chapter 1 What is Meant by Common Sense?; Chapter 2 Subconscious Judgment; Chapter 3 Examples of Subconscious Judgment; Chapter 4 On Abnormal Calculating Power; Chapter 5 Calculating Ability and Intuition; Chapter 6 Musical Genius; Chapter 7 Formal Reasoning and Subconscious Judgment; Chapter 8 Experts as Directors of Commercial Companies; Chapter 9 Experts as Business Men; Chapter 10 Confidence Tricks and their Explanation; Chapter 11 The Mental Limitations of the Globe-trotter; Chapter 12 Opposition to New Ideas; Chapter 13 The Critical Faculty of The Practical Man; Chapter 14 On Educational Systems; Chapter 15 The Mental Ability of The Quakers; Chapter 16 The Teaching of Morality;