Doctor Bell, a renowned Scottish surgeon who is believed to be the prototype of Arthur Conan Doyle's Sherlock Holmes, once held a demonstration of his deductive method of diagnosis. He gathered a group of students around the bed of a new patient and proceeded with questioning. "Aren't you a bandsman?" he asked the ill individual. He nodded. "You see, gentlemen, I am right," said Dr. Bell with some satisfaction. "It is quite elementary. This man has a paralysis of the cheek muscles, the result of too much blowing at wind instruments. We need only inquire to confirm. What instrument do you play, my man?" "The big drum, doctor", replied the patient.