The following passage is from A Study in Scarlet, a novel written by Arthur Conan Doyle and first published in 1887. In this excerpt, John Watson has returned to London after having served in the military during a war. He needs a place to live, so his acquaintance Stamford introduces him to Sherlock Holmes , a detective who is looking for a roommate. Holmes is in a laboratory trying to create a test to detect a part of human blood known as " hoemoglobin " ("hemoglobin " in moder ) From Holmes's exclamation " Ha! ha!"we can infer that he values