the original French. In The Hound of the Baskervilles, the detective recognises works by Godfrey Kneller and Joshua Reynolds: "Watson won't allow that I know anything of art, but that is mere jealousy since our views upon the subject differ". In "The Adventure of the Bruce-Partington Plans", Watson says that "Holmes lost himself in a monograph which he had undertaken upon the Polyphonic Motets of Lassus", considered "the last word" on the subject—which must have been the result of an intensive and very specialized musicological study which could have had no possible application to the solution of criminal mysteries. Holmes is a cryptanalyst, telling Watson that "I am fairly familiar with all forms of secret writing, and am myself the author of a trifling monograph upon the subject, in which I analyse one hundred and sixty separate ciphers". Holmes also demonstrates a knowledge of psychology in "A Scandal in Bohemia", luring Irene Adler into betraying where she hid a photograph based on the premise that a woman will rush to save her most valued possession from a fire. Another example is in "The Adventure of the Blue Carbuncle", where Holmes obtains information from a salesman with a wager: "When you see a man with whiskers of that cut and the 'Pink 'un' protruding out of his pocket, you can always draw him by a bet .... I daresay that if I had put 100 pounds down in front of him, that man would not have given me such complete information as was drawn from him by the idea that he was doing me on a wager". Maria Konnikova points out in an interview with D. J. Grothe that Holmes practises what is now called mindfulness, concentrating on one thing at a time, and almost never "multitasks". She adds that in this he predates the science showing how helpful this is to the brain. Holmesian deduction Holmes observes the dress and attitude of his clients and suspects, noting skin marks (such as tattoos), contamination (such as ink stains or clay on boots), emotional state, and physical condition in order to deduce their origins and recent history. The style and state of wear of a person's clothes and personal items are also commonly relied on; in the stories Holmes is seen applying his method to items such as walking sticks, pipes, and hats. For example, in "A Scandal in Bohemia", Holmes infers