Senses--illusions of, 148 Taste and smell, 149 Heat and cold, 150 Hearing, 150 Touch, 150 Sight--size of spot, 152 Length of lines, 153 Direction of lines, 154 Objects seen through hand, 156 Looking through a brick, 158 Sense, possibility of a new, 123 Shadow going backward on dial, 133 Shakespeare, cost of first folio, 168 Philosopher's stone, 97 Witchcraft, 114 Shanks--value of ratio carried to 707 places, 16 Sharp, Abraham, 16 Sight, sense of, deceived, 152 Smith, James, on squaring circle, 28 Snake lifted by spider, 130 Solvent, universal, 104 Space enlarged by cutting, 126 Spider lifting a snake, 130 Sun-dial--shadow going backward, 133 Taste and smell--illusions, 149 Tides, clock moved by, 40 Will be the great source of power of the future, 40 Time it would take Archimedes to move the world, 171 Touch, sense of, deceived, 150 Transmutation of the metals, 79 Ancient fables, 79 Hermes Trismegistus, 80 Treatises not allegorical, 81 Seven metals, 82 Metals named after planets, 82 Methods of cheating, 83 "Brief of the Golden Calf," 84 Story of unknown Italian, 87 Possibility of effecting, 88 Sir William Ramsay, 89 Effect of such discovery on our currency system, 90 "Tribune," New York, 29 Trisection of angle, 33 Tube and balls, 56 Tube and rope, 59 Universal medicine. See _Elixir of Life_. Van Ceulen, Rudolph, 16 Wallich, Dr., 35 Watch that is wound by walking, 39 Used as a compass, 134 Webb micrographs, 142 Whewell's refutation of 3-1/8 ratio, 28 Wilkins, Bishop, 48 Witchcraft or magic, 113 Worcester, Marquis of, 74 Writing, fine, 139 Young, Dr. Thomas, 44